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

recipe_modules/bot_update/resources/bot_update.py

Index: recipe_modules/bot_update/resources/bot_update.py
diff --git a/recipe_modules/bot_update/resources/bot_update.py b/recipe_modules/bot_update/resources/bot_update.py
index b8b3f0060b9d43d87a88e47faec705accd20852c..df60837d5e4ae606a00cfc9199c66bf121ae8198 100755
--- a/recipe_modules/bot_update/resources/bot_update.py
+++ b/recipe_modules/bot_update/resources/bot_update.py
@@ -1338,8 +1338,8 @@
   # 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 @@
                          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: