Fix patch creation in merge-to-branch script.

tools/push-to-trunk/merge_to_branch.py

 #!/usr/bin/env python
 # Copyright 2014 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
@@ skipping 164 matching lines @@
     TextToFile(self["new_commit_msg"], self.Config(COMMITMSG_FILE))
 
 
 class ApplyPatches(Step):
   MESSAGE = "Apply patches for selected revisions."
 
   def RunStep(self):
     for commit_hash in self["patch_commit_hashes"]:
       print("Applying patch for %s to %s..."
             % (commit_hash, self["merge_to_branch"]))
-      patch = self.GitLog(n=1, patch=True, git_hash=commit_hash)
+      patch = self.GitGetPatch(commit_hash)
       TextToFile(patch, self.Config(TEMPORARY_PATCH_FILE))
       self.ApplyPatch(self.Config(TEMPORARY_PATCH_FILE), self._options.revert)
     if self._options.patch:
       self.ApplyPatch(self._options.patch, self._options.revert)
 
 
 class PrepareVersion(Step):
   MESSAGE = "Prepare version file."
 
   def RunStep(self):
@@ skipping 158 matching lines @@
 def Main():
   parser = BuildOptions()
   options = parser.parse_args()
   if not ProcessOptions(options):
     parser.print_help()
     return 1
   RunMergeToBranch(CONFIG, MergeToBranchOptions(options))
 
 if __name__ == "__main__":
   sys.exit(Main())