webpages_playback: Fix GS path with extra '/'

tools/skp/webpages_playback.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 """Archives or replays webpages and creates SKPs in a Google Storage location.
 
 To archive webpages and store SKP files (archives should be rarely updated):
 
 cd skia
@@ skipping 448 matching lines @@
   def does_storage_object_exist(self, name):
     raise NotImplementedError()
   def download_file(self, name, local_path):
     raise NotImplementedError()
   def upload_dir_contents(self, source_dir, dest_dir):
     raise NotImplementedError()
 
 
 class GoogleStorageDataStore(DataStore):
   def __init__(self, data_store_url):
-    self._url = data_store_url
+    self._url = data_store_url.rstrip('/')
 
   def target_name(self):
     return self._url
 
   def target_type(self):
     return 'Google Storage'
 
   def does_storage_object_exist(self, name):
     try:
       output = subprocess.check_output([
@@ skipping 105 matching lines @@
            '--skia_tools is specified then the debugger is not run.',
       default=False)
   option_parser.add_option(
       '', '--skp_prefix',
       help='Prefix to add to the names of generated SKPs.',
       default=None)
   options, unused_args = option_parser.parse_args()
 
   playback = SkPicturePlayback(options)
   sys.exit(playback.Run())