A handful of nits found while working on blobs.

content/browser/indexed_db/indexed_db_index_writer.cc

 // Copyright (c) 2013 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.
 
 #include "content/browser/indexed_db/indexed_db_index_writer.h"
 
 #include "base/logging.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/browser/indexed_db/indexed_db_backing_store.h"
 #include "content/browser/indexed_db/indexed_db_tracing.h"
@@ skipping 101 matching lines @@
                                                       &found);
   if (!s.ok())
     return false;
   if (!found ||
       (primary_key.IsValid() && found_primary_key->Equals(primary_key)))
     *allowed = true;
   return true;
 }
 
 bool MakeIndexWriters(
-    scoped_refptr<IndexedDBTransaction> transaction,
+    IndexedDBTransaction* transaction,
     IndexedDBBackingStore* backing_store,
     int64 database_id,
     const IndexedDBObjectStoreMetadata& object_store,
     const IndexedDBKey& primary_key,  // makes a copy
     bool key_was_generated,
     const std::vector<IndexedDBDatabase::IndexKeys>& index_keys,
     ScopedVector<IndexWriter>* index_writers,
     base::string16* error_message,
     bool* completed) {
   *completed = false;
@@ skipping 31 matching lines @@
       return true;
 
     index_writers->push_back(index_writer.release());
   }
 
   *completed = true;
   return true;
 }
 
 }  // namespace content