Messages are required to get the right list of reviewers.

Fix gcl which was broken in r196786 and wasn't fixed in r196798.

TBR=dpranke@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/14314009

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@196808 0039d316-1c4b-4281-b951-d872f2087c98

gcl.py

@@ -389,7 +389,7 @@ class ChangeInfo(object):
   def GetApprovingReviewers(self):
     """Returns the issue reviewers list from Rietveld."""
     return git_cl.get_approving_reviewers(
-        self.RpcServer().get_issue_properties(self.issue, False))
+        self.RpcServer().get_issue_properties(self.issue, True))
 
   def AddComment(self, comment):
     """Adds a comment for an issue on Rietveld.