Revert of Delete base/prefs and update callers to use components.

extensions/browser/extension_prefs.h

 // Copyright 2014 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 EXTENSIONS_BROWSER_EXTENSION_PREFS_H_
 #define EXTENSIONS_BROWSER_EXTENSION_PREFS_H_
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
+#include "base/prefs/scoped_user_pref_update.h"
 #include "base/time/time.h"
 #include "base/values.h"
 #include "components/keyed_service/core/keyed_service.h"
-#include "components/prefs/scoped_user_pref_update.h"
 #include "extensions/browser/blacklist_state.h"
 #include "extensions/browser/extension_scoped_prefs.h"
 #include "extensions/browser/install_flag.h"
 #include "extensions/common/constants.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/url_pattern_set.h"
 #include "sync/api/string_ordinal.h"
 
 class ExtensionPrefValueMap;
 class PrefService;
@@ skipping 656 matching lines @@
   bool extensions_disabled_;
 
   base::ObserverList<ExtensionPrefsObserver> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionPrefs);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSION_PREFS_H_