Remove old branch logic from push scripts.

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 23 matching lines @@
 
 ALREADY_MERGING_SENTINEL_FILE = "ALREADY_MERGING_SENTINEL_FILE"
 COMMIT_HASHES_FILE = "COMMIT_HASHES_FILE"
 TEMPORARY_PATCH_FILE = "TEMPORARY_PATCH_FILE"
 
 CONFIG = {
   BRANCHNAME: "prepare-merge",
   PERSISTFILE_BASENAME: "/tmp/v8-merge-to-branch-tempfile",
   ALREADY_MERGING_SENTINEL_FILE:
       "/tmp/v8-merge-to-branch-tempfile-already-merging",
-  TEMP_BRANCH: "prepare-merge-temporary-branch-created-by-script",
   DOT_GIT_LOCATION: ".git",
   VERSION_FILE: "src/version.cc",
   TEMPORARY_PATCH_FILE: "/tmp/v8-prepare-merge-tempfile-temporary-patch",
   COMMITMSG_FILE: "/tmp/v8-prepare-merge-tempfile-commitmsg",
   COMMIT_HASHES_FILE: "/tmp/v8-merge-to-branch-tempfile-PATCH_COMMIT_HASHES",
 }
 
 
 class Preparation(Step):
   MESSAGE = "Preparation."
@@ skipping 270 matching lines @@
       UploadStep,
       CommitRepository,
       PrepareSVN,
       TagRevision,
       CleanUp,
     ]
 
 
 if __name__ == "__main__":  # pragma: no cover
   sys.exit(MergeToBranch(CONFIG).Run())