Clean up unused grit header includes in ui/.

ui/message_center/views/message_center_bubble.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 "ui/message_center/views/message_center_bubble.h"
 
 #include "base/macros.h"
-#include "ui/base/l10n/l10n_util.h"
 #include "ui/message_center/message_center_style.h"
 #include "ui/message_center/views/message_center_view.h"
-#include "ui/strings/grit/ui_strings.h"
 #include "ui/views/layout/fill_layout.h"
 #include "ui/views/widget/widget.h"
 
 namespace message_center {
 
 // ContentsView ////////////////////////////////////////////////////////////////
 
 // Handles changes in MessageCenterView sizes.
 class ContentsView : public views::View {
  public:
@@ skipping 97 matching lines @@
 }
 
 void MessageCenterBubble::OnMouseExitedView() {
 }
 
 size_t MessageCenterBubble::NumMessageViewsForTest() const {
   return message_center_view_->NumMessageViewsForTest();
 }
 
 }  // namespace message_center