Add ManagedModePolicyProvider and extension API to get and set policies.

chrome/browser/prefs/testing_pref_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_PREFS_TESTING_PREF_STORE_H_
 #define CHROME_BROWSER_PREFS_TESTING_PREF_STORE_H_
 #pragma once
 
 #include <string>
 
@@ skipping 56 matching lines @@
  protected:
   virtual ~TestingPrefStore();
 
  private:
   // Stores the preference values.
   PrefValueMap prefs_;
 
   // Flag that indicates if the PrefStore is read-only
   bool read_only_;
 
-  // Flag that indicates if the method WritePrefs was called.
-  bool prefs_written_;
-
   // Whether initialization has been completed.
   bool init_complete_;
 
   ObserverList<PrefStore::Observer, true> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(TestingPrefStore);
 };
 
 #endif  // CHROME_BROWSER_PREFS_TESTING_PREF_STORE_H_