patch_root cleanup: transition everyone to new code.

This doesn't create recipe expectations changes.

Depends: https://codereview.chromium.org/1920903002/
Allows: https://codereview.chromium.org/1913863002

R=machenbach@chromium.org,phajdan.jr@chromium.org
BUG=605563

Review URL: https://codereview.chromium.org/1919863003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@300150 0039d316-1c4b-4281-b951-d872f2087c98

recipe_modules/bot_update/api.py

@@ -85,7 +85,8 @@ class BotUpdateApi(recipe_api.RecipeApi):
     # Construct our bot_update command.  This basically be inclusive of
     # everything required for bot_update to know:
     root = patch_root
-    if root == 'TODO(TANDRII): REMOVE THIS TRANSITION TO patch_projects':
+    if (root == 'TODO(TANDRII): REMOVE THIS TRANSITION TO patch_projects' or
+        root is None):
       # This special condition is here for initial rollout of this code,
       # because it's hard to test this change without rolling into build
       # repository.
@@ -94,13 +95,6 @@ class BotUpdateApi(recipe_api.RecipeApi):
       assert patch_project_roots is None
       root = self.m.gclient.calculate_patch_root(
           self.m.properties.get('patch_project'), cfg)
-      # TODO(tandrii): get rid the condition below after transition.
-
-    if root is None:
-      root = cfg.solutions[0].name
-      additional = self.m.rietveld.calculate_issue_root(patch_project_roots)
-      if additional:
-        root = self.m.path.join(root, additional)
 
     if patch:
       issue = issue or self._issue