ui: Cleanup class/struct forward declarations

ui/app_list/views/search_result_view.h

 // 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.
 
 #ifndef UI_APP_LIST_VIEWS_SEARCH_RESULT_VIEW_H_
 #define UI_APP_LIST_VIEWS_SEARCH_RESULT_VIEW_H_
 
 #include <stddef.h>
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "ui/app_list/search_result_observer.h"
 #include "ui/app_list/views/search_result_actions_view_delegate.h"
 #include "ui/views/context_menu_controller.h"
 #include "ui/views/controls/button/custom_button.h"
 
 namespace gfx {
 class RenderText;
 }
 
 namespace views {
-class ImageButton;
 class ImageView;
 class MenuRunner;
 class ProgressBar;
 }
 
 namespace app_list {
 namespace test {
 class SearchResultListViewTest;
 }  // namespace test
 
 class SearchResult;
 class SearchResultListView;
-class SearchResultViewDelegate;
 class SearchResultActionsView;
 
 // SearchResultView displays a SearchResult.
 class APP_LIST_EXPORT SearchResultView
     : public views::CustomButton,
       public views::ButtonListener,
       public views::ContextMenuController,
       public SearchResultObserver,
       NON_EXPORTED_BASE(public SearchResultActionsViewDelegate) {
  public:
@@ skipping 71 matching lines @@
   views::ProgressBar* progress_bar_;       // Owned by views hierarchy.
 
   std::unique_ptr<views::MenuRunner> context_menu_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchResultView);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_SEARCH_RESULT_VIEW_H_