Revert "Pass target branch from tryserver in bot_update module"

This reverts commit 245337d6.

Reason for revert: broke presubmit builders running run_presubmit.py recipe.

Original change's description:
> Pass target branch from tryserver in bot_update module
> 
> Change-Id: I9d250c87355833ddc6c7d8f41e9e43575713925f
> 
> Recipe-Nontrivial-Roll: build_limited_scripts_slave
> Recipe-Nontrivial-Roll: skia
> Recipe-Nontrivial-Roll: infra
> Recipe-Nontrivial-Roll: build
> Recipe-Nontrivial-Roll: release_scripts
> Change-Id: I9d250c87355833ddc6c7d8f41e9e43575713925f
> Reviewed-on: https://chromium-review.googlesource.com/c/1420977
> Commit-Queue: William Hesse <whesse@google.com>
> Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>

TBR=whesse@google.com,ehmaldonado@chromium.org

Change-Id: I89513b5bb053788291e79340c1685189adc794ec
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/1484655Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>

recipes/README.recipes.md

@@ -52,7 +52,7 @@ Recipe module to ensure a checkout is consistent on a bot.
 
 Wrapper for easy calling of bot_update.
 
-— **def [deapply\_patch](/recipes/recipe_modules/bot_update/api.py#413)(self, bot_update_step):**
+— **def [deapply\_patch](/recipes/recipe_modules/bot_update/api.py#411)(self, bot_update_step):**
 
 Deapplies a patch, taking care of DEPS and solution revisions properly.
     
@@ -68,7 +68,7 @@ Args:
   manifest_name: The name of the manifest to upload to LogDog.  This must
     be unique for the whole build.
 
-— **def [get\_project\_revision\_properties](/recipes/recipe_modules/bot_update/api.py#390)(self, project_name, gclient_config=None):**
+— **def [get\_project\_revision\_properties](/recipes/recipe_modules/bot_update/api.py#388)(self, project_name, gclient_config=None):**
 
 Returns all property names used for storing the checked-out revision of
 a given project.

recipes/recipe_modules/bot_update/api.py

@@ -128,10 +128,8 @@ class BotUpdateApi(recipe_api.RecipeApi):
     if patch:
       repo_url = self.m.tryserver.gerrit_change_repo_url
       fetch_ref = self.m.tryserver.gerrit_change_fetch_ref
-      target_ref = self.m.tryserver.gerrit_change_target_ref
-      if repo_url and fetch_ref and target_ref:
-        flags.append(
-            ['--patch_ref', '%s@%s:%s' % (repo_url, target_ref, fetch_ref)])
+      if repo_url and fetch_ref:
+        flags.append(['--patch_ref', '%s@%s' % (repo_url, fetch_ref)])
       if patch_refs:
         flags.extend(
             ['--patch_ref', patch_ref]

recipes/recipe_modules/bot_update/examples/full.expected/deprecated_got_revision_mapping.json

@@ -56,7 +56,7 @@
       "--output_json",
       "/path/to/tmp/json",
       "--patch_ref",
-      "https://chromium.googlesource.com/chromium/src@refs/heads/master:refs/changes/56/123456/7",
+      "https://chromium.googlesource.com/chromium/src@refs/changes/56/123456/7",
       "--revision",
       "src@HEAD",
       "--disable-syntax-validation"

recipes/recipe_modules/bot_update/examples/full.expected/no_apply_patch_on_gclient.json

@@ -56,7 +56,7 @@
       "--output_json",
       "/path/to/tmp/json",
       "--patch_ref",
-      "https://chromium.googlesource.com/angle/angle@refs/heads/master:refs/changes/56/123456/7",
+      "https://chromium.googlesource.com/angle/angle@refs/changes/56/123456/7",
       "--revision",
       "src@HEAD",
       "--revision",

recipes/recipe_modules/bot_update/examples/full.expected/tryjob_fail.json

@@ -56,7 +56,7 @@
       "--output_json",
       "/path/to/tmp/json",
       "--patch_ref",
-      "https://chromium.googlesource.com/chromium/src@refs/heads/master:refs/changes/56/123456/7",
+      "https://chromium.googlesource.com/chromium/src@refs/changes/56/123456/7",
       "--revision",
       "src@HEAD",
       "--disable-syntax-validation"

recipes/recipe_modules/bot_update/examples/full.expected/tryjob_fail_patch.json

@@ -56,7 +56,7 @@
       "--output_json",
       "/path/to/tmp/json",
       "--patch_ref",
-      "https://chromium.googlesource.com/chromium/src@refs/heads/master:refs/changes/56/123456/7",
+      "https://chromium.googlesource.com/chromium/src@refs/changes/56/123456/7",
       "--revision",
       "src@HEAD",
       "--disable-syntax-validation"

recipes/recipe_modules/bot_update/examples/full.expected/tryjob_fail_patch_download.json

@@ -56,7 +56,7 @@
       "--output_json",
       "/path/to/tmp/json",
       "--patch_ref",
-      "https://chromium.googlesource.com/chromium/src@refs/heads/master:refs/changes/56/123456/7",
+      "https://chromium.googlesource.com/chromium/src@refs/changes/56/123456/7",
       "--revision",
       "src@HEAD",
       "--disable-syntax-validation"

recipes/recipe_modules/bot_update/examples/full.expected/tryjob_gerrit_angle.json

@@ -56,7 +56,7 @@
       "--output_json",
       "/path/to/tmp/json",
       "--patch_ref",
-      "https://chromium.googlesource.com/angle/angle@refs/heads/master:refs/changes/56/123456/7",
+      "https://chromium.googlesource.com/angle/angle@refs/changes/56/123456/7",
       "--revision",
       "src@HEAD",
       "--revision",

recipes/recipe_modules/bot_update/examples/full.expected/tryjob_gerrit_branch_heads.json

@@ -56,7 +56,7 @@
       "--output_json",
       "/path/to/tmp/json",
       "--patch_ref",
-      "https://chromium.googlesource.com/chromium/src@refs/branch-heads/67:refs/changes/56/123456/7",
+      "https://chromium.googlesource.com/chromium/src@refs/changes/56/123456/7",
       "--revision",
       "src@refs/branch-heads/67",
       "--refs",

recipes/recipe_modules/bot_update/examples/full.expected/tryjob_gerrit_feature_branch.json

@@ -56,7 +56,7 @@
       "--output_json",
       "/path/to/tmp/json",
       "--patch_ref",
-      "https://chromium.googlesource.com/chromium/src@refs/heads/experimental/feature:refs/changes/56/123456/7",
+      "https://chromium.googlesource.com/chromium/src@refs/changes/56/123456/7",
       "--revision",
       "src@experimental/feature",
       "--disable-syntax-validation"

recipes/recipe_modules/bot_update/examples/full.expected/tryjob_gerrit_v8_feature_branch.json

@@ -56,7 +56,7 @@
       "--output_json",
       "/path/to/tmp/json",
       "--patch_ref",
-      "https://chromium.googlesource.com/v8/v8@refs/heads/experimental/feature:refs/changes/56/123456/7",
+      "https://chromium.googlesource.com/v8/v8@refs/changes/56/123456/7",
       "--revision",
       "src@HEAD",
       "--revision",

recipes/recipe_modules/bot_update/examples/full.expected/tryjob_gerrit_webrtc.json

@@ -56,7 +56,7 @@
       "--output_json",
       "/path/to/tmp/json",
       "--patch_ref",
-      "https://webrtc.googlesource.com/src@refs/heads/master:refs/changes/56/123456/7",
+      "https://webrtc.googlesource.com/src@refs/changes/56/123456/7",
       "--revision",
       "src@HEAD",
       "--revision",

recipes/recipe_modules/bot_update/examples/full.expected/tryjob_v8.json

@@ -56,7 +56,7 @@
       "--output_json",
       "/path/to/tmp/json",
       "--patch_ref",
-      "https://chromium.googlesource.com/v8/v8@refs/heads/master:refs/changes/56/123456/7",
+      "https://chromium.googlesource.com/v8/v8@refs/changes/56/123456/7",
       "--revision",
       "src@HEAD",
       "--revision",

recipes/recipe_modules/bot_update/examples/full.expected/tryjob_v8_head_by_default.json

@@ -56,7 +56,7 @@
       "--output_json",
       "/path/to/tmp/json",
       "--patch_ref",
-      "https://chromium.googlesource.com/v8/v8@refs/heads/master:refs/changes/56/123456/7",
+      "https://chromium.googlesource.com/v8/v8@refs/changes/56/123456/7",
       "--revision",
       "src@HEAD",
       "--revision",