[release] Fix release script.

tools/release/create_release.py

 #!/usr/bin/env python
 # Copyright 2015 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import argparse
 import os
 import sys
 import tempfile
 import urllib2
@@ skipping 221 matching lines @@
       commit = self.GitLog(
           n=1, format="%H",
           grep=self["commit_title"],
           branch="origin/%s" % self["version"],
       )
     except GitFailedException:
       # In the normal case, the remote doesn't exist yet and git will fail.
       pass
     if commit:
       print "Found %s. Trying to repair tag and bail out." % self["version"]
-      self.step.Git("tag %s %s" % (self["version"], commit))
-      self.step.Git("push origin %s" % self["version"])
+      self.Git("tag %s %s" % (self["version"], commit))
+      self.Git("push origin %s" % self["version"])
       return True
 
 
 class PushBranch(Step):
   MESSAGE = "Push changes."
 
   def RunStep(self):
     pushspecs = [
       "refs/heads/work-branch:refs/pending/heads/%s" % self["version"],
       "%s:refs/pending-tags/heads/%s" % (self["push_hash"], self["version"]),
@@ skipping 72 matching lines @@
       CommitBranch,
       FixBrokenTag,
       PushBranch,
       TagRevision,
       CleanUp,
     ]
 
 
 if __name__ == "__main__":  # pragma: no cover
   sys.exit(CreateRelease().Run())