Not creating ClientUsageTracker for unsupported storage type.

webkit/browser/database/database_quota_client.h

 // Copyright (c) 2011 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.
 
 #ifndef WEBKIT_BROWSER_DATABASE_DATABASE_QUOTA_CLIENT_H_
 #define WEBKIT_BROWSER_DATABASE_DATABASE_QUOTA_CLIENT_H_
 
 #include <set>
 #include <string>
 
@@ skipping 21 matching lines @@
   // QuotaClient method overrides
   virtual ID id() const OVERRIDE;
   virtual void OnQuotaManagerDestroyed() OVERRIDE;
   virtual void GetOriginUsage(const GURL& origin_url,
                               quota::StorageType type,
                               const GetUsageCallback& callback) OVERRIDE;
   virtual void GetOriginsForType(quota::StorageType type,
                                  const GetOriginsCallback& callback) OVERRIDE;
   virtual void GetOriginsForHost(quota::StorageType type,
                                  const std::string& host,
-                                 const GetOriginsCallback& callback)  OVERRIDE;
+                                 const GetOriginsCallback& callback) OVERRIDE;
   virtual void DeleteOriginData(const GURL& origin,
                                 quota::StorageType type,
                                 const DeletionCallback& callback) OVERRIDE;
+  virtual bool DoesSupport(quota::StorageType type) const OVERRIDE;
  private:
   scoped_refptr<base::MessageLoopProxy> db_tracker_thread_;
   scoped_refptr<DatabaseTracker> db_tracker_;  // only used on its thread
 
   DISALLOW_COPY_AND_ASSIGN(DatabaseQuotaClient);
 };
 
 }  // namespace webkit_database
 
 #endif  // WEBKIT_BROWSER_DATABASE_DATABASE_QUOTA_CLIENT_H_