Revert of Gerrit: make git cl close working. (patchset #2 id:20001 of https://codereview.chromium.org/1827523003/ )

Reason for revert:
broke presubmit

Original issue's description:
> Gerrit: make git cl close working.
> 
> BUG=579160
> 
> Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=299465

TBR=machenbach@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=579160

Review URL: https://codereview.chromium.org/1829083002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@299474 0039d316-1c4b-4281-b951-d872f2087c98

git_cl.py

@@ -1593,7 +1593,8 @@ class _GerritChangelistImpl(_ChangelistCodereviewBase):
     raise NotImplementedError()
 
   def CloseIssue(self):
-    gerrit_util.AbandonChange(self._GetGerritHost(), self.GetIssue(), msg='')
+    # TODO(tandrii)
+    raise NotImplementedError()
 
 
 class ChangeDescription(object):