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

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

 # Copyright (c) 2009, 2010, 2011 Google Inc. All rights reserved.
 # Copyright (c) 2009 Apple 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
@@ skipping 162 matching lines @@
     def _deleted_files(self):
         return self._run_status_and_extract_filenames(self.status_command(), self._status_regexp("D"))
 
     @staticmethod
     def supports_local_commits():
         return False
 
     def display_name(self):
         return "svn"
 
-    def svn_revision(self, path):
-        return self.value_from_svn_info(path, 'Revision')
-
     def timestamp_of_revision(self, path, revision):
         # We use --xml to get timestamps like 2013-02-08T08:18:04.964409Z
         repository_root = self.value_from_svn_info(self.checkout_root, 'Repository Root')
         info_output = Executive().run_command([self.executable_name, 'log', '-r', revision, '--xml', repository_root], cwd=path).rstrip()
         match = re.search(r"^<date>(?P<value>.+)</date>\r?$", info_output, re.MULTILINE)
         return match.group('value')
 
     def create_patch(self, git_commit=None, changed_files=None):
         """Returns a byte array (str()) representing the patch file.
         Patch files are effectively binary since they may contain
         files of multiple different encodings."""
         if changed_files == []:
             return ""
         elif changed_files == None:
             changed_files = []
         return self._run([self._filesystem.join(self.checkout_root, 'Tools', 'Scripts', 'svn-create-patch')] + changed_files,
             cwd=self.checkout_root, return_stderr=False,
             decode_output=False)
 
     def blame(self, path):
         return self._run_svn(['blame', path])