indexeddb: Removed use of dangling ptr in writeBlobToFileOnIOThread.

content/browser/indexed_db/indexed_db_context_impl.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 CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_CONTEXT_IMPL_H_
 #define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_CONTEXT_IMPL_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 37 matching lines @@
 
   IndexedDBFactory* GetIDBFactory();
 
   // The indexed db directory.
   static const base::FilePath::CharType kIndexedDBDirectory[];
 
   // Disables the exit-time deletion of session-only data.
   void SetForceKeepSessionState() { force_keep_session_state_ = true; }
 
   // IndexedDBContext implementation:
-  virtual base::TaskRunner* TaskRunner() const OVERRIDE;
+  virtual base::SequencedTaskRunner* TaskRunner() const OVERRIDE;
   virtual std::vector<IndexedDBInfo> GetAllOriginsInfo() OVERRIDE;
   virtual int64 GetOriginDiskUsage(const GURL& origin_url) OVERRIDE;
   virtual void DeleteForOrigin(const GURL& origin_url) OVERRIDE;
   virtual base::FilePath GetFilePathForTesting(
       const std::string& origin_id) const OVERRIDE;
   virtual void SetTaskRunnerForTesting(base::SequencedTaskRunner* task_runner)
       OVERRIDE;
 
   // Methods called by IndexedDBDispatcherHost for quota support.
   void ConnectionOpened(const GURL& origin_url, IndexedDBConnection* db);
@@ skipping 70 matching lines @@
 
   // Only for testing.
   void ResetCaches();
 
   scoped_refptr<IndexedDBFactory> factory_;
   base::FilePath data_path_;
   // If true, nothing (not even session-only data) should be deleted on exit.
   bool force_keep_session_state_;
   scoped_refptr<quota::SpecialStoragePolicy> special_storage_policy_;
   scoped_refptr<quota::QuotaManagerProxy> quota_manager_proxy_;
-  base::SequencedTaskRunner* task_runner_;
+  scoped_refptr<base::SequencedTaskRunner> task_runner_;
   scoped_ptr<std::set<GURL> > origin_set_;
   OriginToSizeMap origin_size_map_;
   OriginToSizeMap space_available_map_;
 
   DISALLOW_COPY_AND_ASSIGN(IndexedDBContextImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_CONTEXT_IMPL_H_