Not creating ClientUsageTracker for unsupported storage type.

webkit/browser/database/database_quota_client.cc

 // 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.
 
 #include "webkit/browser/database/database_quota_client.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 197 matching lines @@
   PostTaskAndReplyWithResult(
       db_tracker_thread_.get(),
       FROM_HERE,
       base::Bind(&DatabaseTracker::DeleteDataForOrigin,
                  db_tracker_,
                  webkit_database::GetIdentifierFromOrigin(origin),
                  delete_callback),
       delete_callback);
 }
 
+bool DatabaseQuotaClient::DoesSupport(quota::StorageType type) const {
+  return type == quota::kStorageTypeTemporary;
+}
+
 }  // namespace webkit_database