Fix webkit build failure reported by evan@

build/util/lastchange.py

 #!/usr/bin/env python
 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """
 lastchange.py -- Chromium revision fetching utility.
 """
 
 import re
@@ skipping 111 matching lines @@
 
 def FetchGitSVNURL(directory):
   """
   Fetch URL of SVN repository bound to git.
 
   Errors are swallowed.
 
   Returns:
     SVN URL.
   """
-  if not IsGitSVN(directory):
-    return None
-  proc = RunGitCommand(directory, ['svn', 'info', '--url'])
-  if proc:
-    output = proc.communicate()[0].strip()
-    if proc.returncode == 0:
-      return output
-  return None
+  if IsGitSVN(directory):
+    proc = RunGitCommand(directory, ['svn', 'info', '--url'])
+    if proc:
+      output = proc.communicate()[0].strip()
+      if proc.returncode == 0:
+        match = re.search(r'^\w+://.*$', output, re.M)
+        if match:
+          return match.group(0)
+  return ''
 
 
 def LookupGitSVNRevision(directory, depth):
   """
   Fetch the Git-SVN identifier for the local tree.
   Parses first |depth| commit messages.
 
   Errors are swallowed.
   """
   if not IsGitSVN(directory):
@@ skipping 101 matching lines @@
     if out_file:
       WriteIfChanged(out_file, contents)
     else:
       sys.stdout.write(contents)
 
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())