Prefix string16 with base:: in ui/.

ui/message_center/views/message_popup_collection_unittest.cc

 // Copyright (c) 2013 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 "ui/message_center/views/message_popup_collection.h"
 
 #include <list>
 
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 72 matching lines @@
   }
 
   std::string AddNotification() {
     std::string id = base::IntToString(id_++);
     scoped_ptr<Notification> notification(
         new Notification(NOTIFICATION_TYPE_BASE_FORMAT,
                          id,
                          UTF8ToUTF16("test title"),
                          UTF8ToUTF16("test message"),
                          gfx::Image(),
-                         string16() /* display_source */,
+                         base::string16() /* display_source */,
                          NotifierId(),
                          message_center::RichNotificationData(),
                          NULL /* delegate */));
     MessageCenter::Get()->AddNotification(notification.Pass());
     return id;
   }
 
   void PrepareForWait() { collection_->CreateRunLoopForTest(); }
 
   // Assumes there is non-zero pending work.
@@ skipping 298 matching lines @@
   std::string id2 = AddNotification();
 
   WaitForTransitionsDone();
   views::WidgetDelegateView* toast2 = GetToast(id2);
   EXPECT_TRUE(toast2 != NULL);
 }
 
 
 }  // namespace test
 }  // namespace message_center