Switch release scripts to pure git.

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 258 matching lines @@
       if not options.patch:
         print "Either a patch file or revision numbers must be specified"
         return False
       if not options.message:
         print "You must specify a merge comment if no patches are specified"
         return False
     options.bypass_upload_hooks = True
     # CC ulan to make sure that fixes are merged to Google3.
     options.cc = "ulan@chromium.org"
 
-    # Thd old git-svn workflow is deprecated for this script.
-    assert options.vc_interface != "git_svn"
-
     # Make sure to use git hashes in the new workflows.
     for revision in options.revisions:
       if (IsSvnNumber(revision) or
           (revision[0:1] == "r" and IsSvnNumber(revision[1:]))):
         print "Please provide full git hashes of the patches to merge."
         print "Got: %s" % revision
         return False
     return True
 
   def _Config(self):
@@ skipping 18 matching lines @@
       CommitLocal,
       UploadStep,
       CommitRepository,
       TagRevision,
       CleanUp,
     ]
 
 
 if __name__ == "__main__":  # pragma: no cover
   sys.exit(MergeToBranch().Run())