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

components/prefs/pref_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 COMPONENTS_PREFS_PREF_VALUE_STORE_H_
-#define COMPONENTS_PREFS_PREF_VALUE_STORE_H_
+#ifndef BASE_PREFS_PREF_VALUE_STORE_H_
+#define BASE_PREFS_PREF_VALUE_STORE_H_
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/values.h"
 #include "components/prefs/base_prefs_export.h"
 #include "components/prefs/pref_store.h"
 
 class PrefNotifier;
 class PrefStore;
 
 // The PrefValueStore manages various sources of values for Preferences
 // (e.g., configuration policies, extensions, and user settings). It returns
 // the value of a Preference from the source with the highest priority, and
 // allows setting user-defined values for preferences that are not managed.
 //
 // Unless otherwise explicitly noted, all of the methods of this class must
 // be called on the UI thread.
-class COMPONENTS_PREFS_EXPORT PrefValueStore {
+class BASE_PREFS_EXPORT PrefValueStore {
  public:
   typedef base::Callback<void(const std::string&)> PrefChangedCallback;
 
   // In decreasing order of precedence:
   //   |managed_prefs| contains all preferences from mandatory policies.
   //   |supervised_user_prefs| contains all preferences from supervised user
   //        settings, i.e. settings configured for a supervised user by their
   //        custodian.
   //   |extension_prefs| contains preference values set by extensions.
   //   |command_line_prefs| contains preference values set by command-line
@@ skipping 210 matching lines @@
 
   // A mapping of preference names to their registered types.
   PrefTypeMap pref_types_;
 
   // True if not all of the PrefStores were initialized successfully.
   bool initialization_failed_;
 
   DISALLOW_COPY_AND_ASSIGN(PrefValueStore);
 };
 
-#endif  // COMPONENTS_PREFS_PREF_VALUE_STORE_H_
+#endif  // BASE_PREFS_PREF_VALUE_STORE_H_