Update some uses of Value in chrome/browser to use the base:: namespace.

chrome/browser/chromeos/login/screens/screen_manager.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_CHROMEOS_LOGIN_SCREENS_SCREEN_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_SCREEN_MANAGER_H_
 
 #include <map>
 #include <stack>
 #include <string>
@@ skipping 77 matching lines @@
       (screen->*method)(arg1);
     } else {
       NOTREACHED();
     }
   }
 
   // ScreenManagerHandler::Delegate implementation:
   virtual void OnButtonPressed(const std::string& screen_name,
                                const std::string& button_id) OVERRIDE;
   virtual void OnContextChanged(const std::string& screen_name,
-                                const DictionaryValue* diff) OVERRIDE;
+                                const base::DictionaryValue* diff) OVERRIDE;
 
   typedef std::map<std::string, linked_ptr<BaseScreen> > ScreenMap;
 
   // Factory of screens.
   scoped_ptr<ScreenFactory> factory_;
 
   // Root of all screen handlers.
   OobeDisplay* display_;
 
   // Current screen flow.
@@ skipping 16 matching lines @@
   std::string start_screen_;
   scoped_ptr<ScreenContext> start_screen_params_;
   bool start_screen_popup_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenManager);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_SCREEN_MANAGER_H_