Remove list directory from storage driver

storage/local.py

@@ -56,18 +56,6 @@ class LocalStorage(BaseStorageV2):
     with open(path, mode='wb') as out_fp:
       self.stream_write_to_fp(fp, out_fp)
 
-  def list_directory(self, path=None):
-    path = self._init_path(path)
-    prefix = path[len(self._root_path) + 1:] + '/'
-    exists = False
-    for d in os.listdir(path):
-      exists = True
-      yield prefix + d
-    if exists is False:
-      # Raises OSError even when the directory is empty
-      # (to be consistent with S3)
-      raise OSError('No such directory: \'{0}\''.format(path))
-
   def exists(self, path):
     path = self._init_path(path)
     return os.path.exists(path)