Unrevert r141537: Add extensions::StateStore and use that instead of

chrome/browser/value_store/failing_value_store.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_VALUE_STORE_FAILING_VALUE_STORE_H_
 #define CHROME_BROWSER_VALUE_STORE_FAILING_VALUE_STORE_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "chrome/browser/value_store/value_store.h"
 
 // Settings storage area which fails every request.
-class FailingSettingsStorage : public ValueStore {
+class FailingValueStore : public ValueStore {
  public:
-  FailingSettingsStorage() {}
+  FailingValueStore() {}
 
   // ValueStore implementation.
   virtual size_t GetBytesInUse(const std::string& key) OVERRIDE;
   virtual size_t GetBytesInUse(const std::vector<std::string>& keys) OVERRIDE;
   virtual size_t GetBytesInUse() OVERRIDE;
   virtual ReadResult Get(const std::string& key) OVERRIDE;
   virtual ReadResult Get(const std::vector<std::string>& keys) OVERRIDE;
   virtual ReadResult Get() OVERRIDE;
   virtual WriteResult Set(
       WriteOptions options,
       const std::string& key,
       const Value& value) OVERRIDE;
   virtual WriteResult Set(
       WriteOptions options, const DictionaryValue& values) OVERRIDE;
   virtual WriteResult Remove(const std::string& key) OVERRIDE;
   virtual WriteResult Remove(const std::vector<std::string>& keys) OVERRIDE;
   virtual WriteResult Clear() OVERRIDE;
 
  private:
-  DISALLOW_COPY_AND_ASSIGN(FailingSettingsStorage);
+  DISALLOW_COPY_AND_ASSIGN(FailingValueStore);
 };
 
 #endif  // CHROME_BROWSER_VALUE_STORE_FAILING_VALUE_STORE_H_