Docserver: there is only one.

chrome/common/extensions/docs/server2/appengine_blobstore.py

 # 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.
 
 import blob_reference_store as datastore
 from blob_reference_store import BlobReferenceStore
 from appengine_wrappers import blobstore
 from appengine_wrappers import files
 
 BLOBSTORE_GITHUB = 'BlobstoreGithub'
 
 class AppEngineBlobstore(object):
   """A wrapper around the blobstore API, which stores the blob keys in
   datastore.
   """
   def __init__(self):
-    self._datastore = BlobReferenceStore('blobstore')
+    self._datastore = BlobReferenceStore()
 
   def Set(self, key, blob, namespace):
     """Add a blob to the blobstore. |version| is used as part of the key so
     multiple blobs with the same name can be differentiated.
     """
     key = namespace + '.' + key
     filename = files.blobstore.create()
     with files.open(filename, 'a') as f:
       f.write(blob)
     files.finalize(filename)
@@ skipping 11 matching lines @@
     return blob_reader.read()
 
   def Delete(self, key, namespace):
     """Delete the blob with version |version| if it is found.
     """
     key = namespace + '.' + key
     blob_key = self._datastore.Delete(datastore.BLOB_REFERENCE_BLOBSTORE, key)
     if blob_key is None:
       return
     blob_key.delete()