Make chromium-roll script non-interactive.

tools/push-to-trunk/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 77 matching lines @@
 
 class RollChromium(Step):
   MESSAGE = "Roll V8 into Chromium."
 
   def RunStep(self):
     if self._options.roll:
       args = [
         "--author", self._options.author,
         "--reviewer", self._options.reviewer,
         "--chromium", self._options.chromium,
-        "--force",
         "--use-commit-queue",
       ]
       if self._options.sheriff:
         args.extend([
             "--sheriff", "--googlers-mapping", self._options.googlers_mapping])
       R = chromium_roll.ChromiumRoll
       self._side_effect_handler.Call(
           R(chromium_roll.CONFIG, self._side_effect_handler).Run,
           args)
 
@@ skipping 21 matching lines @@
       CheckActiveRoll,
       DetectLastPush,
       DetectLastRoll,
       CheckClusterFuzz,
       RollChromium,
     ]
 
 
 if __name__ == "__main__":  # pragma: no cover
   sys.exit(AutoRoll(CONFIG).Run())