Let IndexedDBContextImpl create its own task runner

content/public/browser/indexed_db_context.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_PUBLIC_BROWSER_INDEXED_DB_CONTEXT_H_
 #define CONTENT_PUBLIC_BROWSER_INDEXED_DB_CONTEXT_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 26 matching lines @@
 
   // Copies the indexed db files from this context to another. The
   // indexed db directory in the destination context needs to be empty.
   virtual void CopyOriginData(const GURL& origin_url,
                               IndexedDBContext* dest_context) = 0;
 
   // Get the file name of the local storage file for the given origin.
   virtual base::FilePath GetFilePathForTesting(
       const GURL& origin_url) const = 0;
 
-  // Set the task runner for tests if browser main loop is not initialized.
-  virtual void SetTaskRunnerForTesting(
-      base::SequencedTaskRunner* task_runner) = 0;
+  // Forget the origins/sizes read from disk.
+  virtual void ResetCachesForTesting() = 0;
 
  protected:
   friend class base::RefCountedThreadSafe<IndexedDBContext>;
   virtual ~IndexedDBContext() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_INDEXED_DB_CONTEXT_H_