Not creating ClientUsageTracker for unsupported storage type.

webkit/browser/fileapi/file_system_quota_client.h

 // 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.
 
 #ifndef WEBKIT_BROWSER_FILEAPI_FILE_SYSTEM_QUOTA_CLIENT_H_
 #define WEBKIT_BROWSER_FILEAPI_FILE_SYSTEM_QUOTA_CLIENT_H_
 
 #include <set>
 #include <string>
 #include <utility>
@@ skipping 38 matching lines @@
       quota::StorageType type,
       const GetOriginsCallback& callback) OVERRIDE;
   virtual void GetOriginsForHost(
       quota::StorageType type,
       const std::string& host,
       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:
   base::SequencedTaskRunner* file_task_runner() const;
 
   scoped_refptr<FileSystemContext> file_system_context_;
 
   bool is_incognito_;
 
   DISALLOW_COPY_AND_ASSIGN(FileSystemQuotaClient);
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_BROWSER_FILEAPI_FILE_SYSTEM_QUOTA_CLIENT_H_