Call _UpdateBranchHeads within _Clone.

This will avoid errors where _Clone is called for a new DEP, but where the DEP
refers to a branch commit, thus causing the clone to fail because it can't
checkout that commit (such as happens currently with 'fetch v8').

Review URL: https://codereview.chromium.org/307223006

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@274347 0039d316-1c4b-4281-b951-d872f2087c98

gclient_scm.py

@@ -376,7 +376,6 @@ class GitWrapper(SCMWrapper):
       except subprocess2.CalledProcessError:
         self._DeleteOrMove(options.force)
         self._Clone(revision, url, options)
-      self._UpdateBranchHeads(options, fetch=True)
       if deps_revision and deps_revision.startswith('branch-heads/'):
         deps_branch = deps_revision.replace('branch-heads/', '')
         self._Capture(['branch', deps_branch, deps_revision])
@@ -821,6 +820,7 @@ class GitWrapper(SCMWrapper):
       if os.listdir(tmp_dir):
         self.Print('_____ removing non-empty tmp dir %s' % tmp_dir)
       gclient_utils.rmtree(tmp_dir)
+    self._UpdateBranchHeads(options, fetch=True)
     self._Run(['checkout', '--quiet', revision.replace('refs/heads/', '')],
               options)
     if self._GetCurrentBranch() is None: