chrome: Cleanup class/struct forward declarations

chrome/browser/ui/views/intent_picker_bubble_view.h

 // Copyright 2016 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_UI_VIEWS_INTENT_PICKER_BUBBLE_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_INTENT_PICKER_BUBBLE_VIEW_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "chrome/browser/chromeos/arc/intent_helper/arc_navigation_throttle.h"
 #include "chrome/browser/ui/browser_dialogs.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "ui/base/accelerators/accelerator.h"
 #include "ui/gfx/image/image.h"
 #include "ui/views/bubble/bubble_dialog_delegate.h"
 #include "ui/views/controls/button/button.h"
 
 namespace content {
 class WebContents;
 }  // namespace content
 
 namespace views {
-class Label;
-class LabelButton;
 class View;
 class Widget;
 }  // namespace views
 
 namespace ui {
 class Event;
 }  // namespace ui
 
 class IntentPickerLabelButton;
 
@@ skipping 99 matching lines @@
   size_t selected_app_tag_ = 0;
 
   views::ScrollView* scroll_view_;
 
   std::vector<AppInfo> app_info_;
 
   DISALLOW_COPY_AND_ASSIGN(IntentPickerBubbleView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_INTENT_PICKER_BUBBLE_VIEW_H_