Fetch Gerrit cl description from gitiles.

R=andybons@chromium.org,scottmg@chromium.org
BUG=603207,605563

Review URL: https://codereview.chromium.org/1916123002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@300161 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/git_cl.py b/git_cl.py
index bb31fa0..0edde48 100755
--- a/git_cl.py
+++ b/git_cl.py
@@ -2161,8 +2161,10 @@
     return data['revisions'][data['current_revision']]['_number']
 
   def FetchDescription(self):
-    data = self._GetChangeDetail(['COMMIT_FOOTERS', 'CURRENT_REVISION'])
-    return data['revisions'][data['current_revision']]['commit_with_footers']
+    data = self._GetChangeDetail(['CURRENT_REVISION'])
+    current_rev = data['current_revision']
+    url = data['revisions'][current_rev]['fetch']['http']['url']
+    return gerrit_util.GetChangeDescriptionFromGitiles(url, current_rev)
 
   def UpdateDescriptionRemote(self, description):
     # TODO(tandrii)