Revert of bot_update: call gclient sync after checking out a gerrit ref...

Revert of bot_update: call gclient sync after checking out a gerrit ref (patchset #1 id:1 of https://codereview.chromium.org/1904663002/ )

Reason for revert:
I believe this is mostly likely to have broken Angle, but this is speculative.

http://crbug.com/606150

Original issue's description:
> bot_update: call gclient sync after checking out a gerrit ref
> 
> BUG=chromium:602906
> 
> Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=300109

TBR=hinoka@chromium.org,yyanagisawa@chromium.org,hinoka@google.com,phajdan.jr@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=chromium:602906

Review URL: https://codereview.chromium.org/1918903003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@300159 0039d316-1c4b-4281-b951-d872f2087c98

recipe_modules/bot_update/resources/bot_update.py

@@ -1338,8 +1338,8 @@ def ensure_checkout(solutions, revisions, first_sln, target_os, target_os_only,
   # Let gclient do the DEPS syncing.
   # The branch-head refspec is a special case because its possible Chrome
   # src, which contains the branch-head refspecs, is DEPSed in.
-  with_branch_heads = (buildspec or BRANCH_HEADS_REFSPEC in refs)
-  gclient_output = gclient_sync(with_branch_heads, shallow)
+  gclient_output = gclient_sync(buildspec or BRANCH_HEADS_REFSPEC in refs,
+                                shallow)
 
   # Now that gclient_sync has finished, we should revert any .DEPS.git so that
   # presubmit doesn't complain about it being modified.
@@ -1366,7 +1366,6 @@ def ensure_checkout(solutions, revisions, first_sln, target_os, target_os_only,
                          apply_issue_key_file, blacklist=already_patched)
   elif gerrit_ref:
     apply_gerrit_ref(gerrit_repo, gerrit_ref, patch_root, gerrit_reset)
-    gclient_sync(with_branch_heads, shallow)
 
   # Reset the deps_file point in the solutions so that hooks get run properly.
   for sln in solutions: