indexeddb: Removed use of dangling ptr in writeBlobToFileOnIOThread.

content/browser/indexed_db/indexed_db_fake_backing_store.h

 // Copyright 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.
 
 #ifndef CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_FAKE_BACKING_STORE_H_
 #define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_FAKE_BACKING_STORE_H_
 
 #include <vector>
 
 #include "content/browser/indexed_db/indexed_db_backing_store.h"
 
 namespace base {
-class TaskRunner;
+class SequencedTaskRunner;
 }
 
 namespace content {
 
 class IndexedDBFactory;
 
 class IndexedDBFakeBackingStore : public IndexedDBBackingStore {
  public:
   IndexedDBFakeBackingStore();
   IndexedDBFakeBackingStore(IndexedDBFactory* factory,
-                            base::TaskRunner* task_runner);
+                            base::SequencedTaskRunner* task_runner);
   virtual std::vector<base::string16> GetDatabaseNames(leveldb::Status* s)
       OVERRIDE;
   virtual leveldb::Status GetIDBDatabaseMetaData(const base::string16& name,
                                                  IndexedDBDatabaseMetadata*,
                                                  bool* found) OVERRIDE;
   virtual leveldb::Status CreateIDBDatabaseMetaData(
       const base::string16& name,
       const base::string16& version,
       int64 int_version,
       int64* row_id) OVERRIDE;
@@ skipping 117 matching lines @@
   friend class base::RefCounted<IndexedDBFakeBackingStore>;
   virtual ~IndexedDBFakeBackingStore();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(IndexedDBFakeBackingStore);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_FAKE_BACKING_STORE_H_