Fix delete_path in webpages_playback.py

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 477 matching lines @@
     self._bucket = remove_prefix(self._data_store_url.lstrip(),
                                  gs_utils.GS_PREFIX)
     self.gs = gs_utils.GSUtils()
   def target_name(self):
     return self._data_store_url
   def target_type(self):
     return 'Google Storage'
   def does_storage_object_exist(self, *args):
     return self.gs.does_storage_object_exist(self._bucket, *args)
   def delete_path(self, path):
-    return self.gs.delete_file(self._bucket, path)
+    _, files = self.gs.list_bucket_contents(self._bucket, subdir=path)
+    for f in files:
+      self.gs.delete_file(self._bucket, posixpath.join(path, f))
   def download_file(self, *args):
     self.gs.download_file(self._bucket, *args)
   def upload_dir_contents(self, source_dir, **kwargs):
     self.gs.upload_dir_contents(source_dir, self._bucket, **kwargs)
 
 class LocalFileSystemDataStore(DataStore):
   def __init__(self, data_store_location):
     self._base_dir = data_store_location
   def target_name(self):
     return self._base_dir
@@ skipping 81 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())