Use chromium revision instead of blink svn revision when rebaselining layout tests.

third_party/WebKit/Tools/Scripts/webkitpy/common/checkout/scm/scm_mock.py

 # Copyright (C) 2011 Google Inc. 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 disclaimer
@@ skipping 58 matching lines @@
         return True
 
     def exists(self, path):
         # TestRealMain.test_real_main (and several other rebaseline tests) are sensitive to this return value.
         # We should make those tests more robust, but for now we just return True always (since no test needs otherwise).
         return True
 
     def absolute_path(self, *comps):
         return self._filesystem.join(self.checkout_root, *comps)
 
-    def svn_revision(self, path):
+    def commit_position(self, path):
         return '5678'
 
-    def svn_revision_from_git_commit(self, git_commit):
+    def commit_position_from_git_commit(self, git_commit):
         if git_commit == '6469e754a1':
             return 1234
         if git_commit == '624c3081c0':
             return 5678
         if git_commit == '624caaaaaa':
             return 10000
         return None
 
     def timestamp_of_revision(self, path, revision):
         return '2013-02-01 08:48:05 +0000'
@@ skipping 10 matching lines @@
         for path in paths:
             if self._filesystem.exists(path):
                 self._filesystem.remove(path)
 
     def move(self, origin, destination):
         if self._filesystem:
             self._filesystem.move(self.absolute_path(origin), self.absolute_path(destination))
 
     def changed_files(self):
         return []