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

chrome/browser/automation/automation_event_observers_chromeos.cc

 // 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.
 
 #include "chrome/browser/automation/automation_event_observers.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chromeos/login/existing_user_controller.h"
 
 using chromeos::ExistingUserController;
 
@@ skipping 21 matching lines @@
   // the correct one.
   if (automation_) {
     automation_->set_profile(
         g_browser_process->profile_manager()->GetLastUsedProfile());
   }
   VLOG(1) << "Successfully logged in.";
   _NotifyLoginEvent(std::string());
 }
 
 void LoginEventObserver::_NotifyLoginEvent(const std::string& error_string) {
-  DictionaryValue* dict = new DictionaryValue;
+  base::DictionaryValue* dict = new base::DictionaryValue;
   dict->SetString("type", "login_event");
   if (error_string.length())
     dict->SetString("error_string", error_string);
   NotifyEvent(dict);
   ExistingUserController* controller =
       ExistingUserController::current_controller();
   if (controller)
     controller->set_login_status_consumer(NULL);
   RemoveIfDone();
 }