Eliminate ash::internal namespace

ash/display/resolution_notification_controller.h

Index: ash/display/resolution_notification_controller.h
diff --git a/ash/display/resolution_notification_controller.h b/ash/display/resolution_notification_controller.h
index bacc9c8bee38e4ba02cece526ea6bd67e4bb866b..23a582dc112fb51116e339907569d67d9a6c6ee9 100644
--- a/ash/display/resolution_notification_controller.h
+++ b/ash/display/resolution_notification_controller.h
@@ -23,7 +23,7 @@ class Widget;
 }  // namespace views
 
 namespace ash {
-namespace internal {
+
 // A class which manages the notification of display resolution change and
 // also manages the timeout in case the new resolution is unusable.
 class ASH_EXPORT ResolutionNotificationController
@@ -93,7 +93,6 @@ class ASH_EXPORT ResolutionNotificationController
   DISALLOW_COPY_AND_ASSIGN(ResolutionNotificationController);
 };
 
-}  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_DISPLAY_RESOLUTION_NOTIFICATION_CONTROLLER_H_