Add sheriff details to roll commit message.

tools/release/auto_roll.py

 #!/usr/bin/env python
 # Copyright 2014 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 json
 import os
 import sys
 import urllib
@@ skipping 81 matching lines @@
   def RunStep(self):
     if self._options.roll:
       args = [
         "--author", self._options.author,
         "--reviewer", self._options.reviewer,
         "--chromium", self._options.chromium,
         "--last-roll", self["last_roll"],
         "--use-commit-queue",
       ]
       if self._options.sheriff:
-        args.extend([
-            "--sheriff", "--googlers-mapping", self._options.googlers_mapping])
+        args.append("--sheriff")
       if self._options.dry_run:
-        args.extend(["--dry-run"])
+        args.append("--dry-run")
       if self._options.work_dir:
         args.extend(["--work-dir", self._options.work_dir])
       self._side_effect_handler.Call(chromium_roll.ChromiumRoll().Run, args)
 
 
 class AutoRoll(ScriptsBase):
   def _PrepareOptions(self, parser):
     parser.add_argument("-c", "--chromium", required=True,
                         help=("The path to your Chromium src/ "
                               "directory to automate the V8 roll."))
@@ skipping 19 matching lines @@
     return [
       CheckActiveRoll,
       DetectLastRoll,
       CheckClusterFuzz,
       RollChromium,
     ]
 
 
 if __name__ == "__main__":  # pragma: no cover
   sys.exit(AutoRoll().Run())