Move base/values.h into the base namespace.

chrome/browser/extensions/extension_preference_api.h

 // Copyright (c) 2011 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_PREFERENCE_API_H__
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFERENCE_API_H__
 #pragma once
 
 #include <string>
 
 #include "chrome/browser/extensions/extension_function.h"
 #include "chrome/browser/prefs/pref_change_registrar.h"
 #include "content/common/notification_observer.h"
 
+namespace base {
+class Value;
+}
+
 class ExtensionPreferenceEventRouter : public NotificationObserver {
  public:
   explicit ExtensionPreferenceEventRouter(Profile* profile);
   virtual ~ExtensionPreferenceEventRouter();
 
  private:
   // NotificationObserver implementation.
   virtual void Observe(int type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
   void OnPrefChanged(PrefService* pref_service, const std::string& pref_key);
 
   // This method dispatches events to the extension message service.
   void DispatchEvent(const std::string& extension_id,
                      const std::string& event_name,
                      const std::string& json_args);
 
   PrefChangeRegistrar registrar_;
   PrefChangeRegistrar incognito_registrar_;
 
   // Weak, owns us (transitively via ExtensionService).
   Profile* profile_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionPreferenceEventRouter);
 };
 
-class Value;
-
 class PrefTransformerInterface {
  public:
   virtual ~PrefTransformerInterface() {}
 
   // Converts the representation of a preference as seen by the extension
   // into a representation that is used in the pref stores of the browser.
   // Returns the pref store representation in case of success or sets
   // |error| and returns NULL otherwise. |bad_message| is passed to simulate
   // the behavior of EXTENSION_FUNCTION_VALIDATE. It is never NULL.
   // The ownership of the returned value is passed to the caller.
-  virtual Value* ExtensionToBrowserPref(const Value* extension_pref,
-                                        std::string* error,
-                                        bool* bad_message) = 0;
+  virtual base::Value* ExtensionToBrowserPref(
+      const base::Value* extension_pref,
+      std::string* error,
+      bool* bad_message) = 0;
 
   // Converts the representation of the preference as stored in the browser
   // into a representation that is used by the extension.
   // Returns the extension representation in case of success or NULL otherwise.
   // The ownership of the returned value is passed to the caller.
-  virtual Value* BrowserToExtensionPref(const Value* browser_pref) = 0;
+  virtual base::Value* BrowserToExtensionPref(
+      const base::Value* browser_pref) = 0;
 };
 
 class GetPreferenceFunction : public SyncExtensionFunction {
  public:
   virtual ~GetPreferenceFunction();
   virtual bool RunImpl();
   DECLARE_EXTENSION_FUNCTION_NAME("types.ChromeSetting.get")
 };
 
 class SetPreferenceFunction : public SyncExtensionFunction {
  public:
   virtual ~SetPreferenceFunction();
   virtual bool RunImpl();
   DECLARE_EXTENSION_FUNCTION_NAME("types.ChromeSetting.set")
 };
 
 class ClearPreferenceFunction : public SyncExtensionFunction {
  public:
   virtual ~ClearPreferenceFunction();
   virtual bool RunImpl();
   DECLARE_EXTENSION_FUNCTION_NAME("types.ChromeSetting.clear")
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_PREFERENCE_API_H__