Make lookup of last v8 roll work with pure git.

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
 
 from common_includes import *
 import chromium_roll
 
 CLUSTERFUZZ_API_KEY_FILE = "CLUSTERFUZZ_API_KEY_FILE"
 
 CONFIG = {
   PERSISTFILE_BASENAME: "/tmp/v8-auto-roll-tempfile",
   CLUSTERFUZZ_API_KEY_FILE: ".cf_api_key",
 }
 
-CR_DEPS_URL = 'http://src.chromium.org/svn/trunk/src/DEPS'
 
 class CheckActiveRoll(Step):
   MESSAGE = "Check active roll."
 
   @staticmethod
   def ContainsChromiumRoll(changes):
     for change in changes:
       if change["subject"].startswith("Update V8 to"):
         return True
     return False
@@ skipping 20 matching lines @@
     push_hash = self.FindLastTrunkPush(
         branch="origin/master", include_patches=True)
     self["last_push"] = self.GetCommitPositionNumber(push_hash)
 
 
 class DetectLastRoll(Step):
   MESSAGE = "Detect commit ID of the last Chromium roll."
 
   def RunStep(self):
     # Interpret the DEPS file to retrieve the v8 revision.
+    # TODO(machenbach): This should be part or the roll-deps api of
+    # depot_tools.
     Var = lambda var: '%s'
-    exec(self.ReadURL(CR_DEPS_URL))
-    last_roll = vars['v8_revision']
+    exec(FileToText(os.path.join(self._options.chromium, "DEPS")))
+    last_roll = self.GetCommitPositionNumber(vars['v8_revision'])
     # FIXME(machenbach): When rolling from bleeding edge and from trunk there
     # be different commit numbers here. Better use version?
     if int(last_roll) >= int(self["last_push"]):
       print("There is no newer v8 revision than the one in Chromium (%s)."
             % last_roll)
       return True
 
 
 class CheckClusterFuzz(Step):
   MESSAGE = "Check ClusterFuzz api for new problems."
@@ skipping 57 matching lines @@
       CheckActiveRoll,
       DetectLastPush,
       DetectLastRoll,
       CheckClusterFuzz,
       RollChromium,
     ]
 
 
 if __name__ == "__main__":  # pragma: no cover
   sys.exit(AutoRoll(CONFIG).Run())