Moved JsonPrefStore to use SequencedWorkerPool

chrome/browser/extensions/extension_prefs_unittest.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 CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFS_UNITTEST_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFS_UNITTEST_H_
 
 #include "base/message_loop.h"
 #include "chrome/browser/extensions/test_extension_prefs.h"
 #include "content/public/test/test_browser_thread.h"
@@ skipping 26 matching lines @@
 
   virtual void SetUp() OVERRIDE;
 
   virtual void TearDown() OVERRIDE;
 
  protected:
   ExtensionPrefs* prefs() { return prefs_.prefs(); }
 
   MessageLoop message_loop_;
   content::TestBrowserThread ui_thread_;
-  content::TestBrowserThread file_thread_;
 
   TestExtensionPrefs prefs_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ExtensionPrefsTest);
 };
 
 class ExtensionPrefsPrepopulatedTest : public ExtensionPrefsTest {
  public:
   ExtensionPrefsPrepopulatedTest();
@@ skipping 34 matching lines @@
 
   scoped_refptr<Extension> ext1_scoped_;
   scoped_refptr<Extension> ext2_scoped_;
   scoped_refptr<Extension> ext3_scoped_;
   scoped_refptr<Extension> ext4_scoped_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFS_UNITTEST_H_