ui: Cleanup class/struct forward declarations

ui/app_list/views/search_result_page_view.h

 // Copyright 2014 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_PAGE_VIEW_H_
 #define UI_APP_LIST_VIEWS_SEARCH_RESULT_PAGE_VIEW_H_
 
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "ui/app_list/app_list_export.h"
 #include "ui/app_list/app_list_model.h"
 #include "ui/app_list/views/app_list_page.h"
 #include "ui/app_list/views/search_result_container_view.h"
 
 namespace app_list {
 
-class AppListMainView;
-class AppListViewDelegate;
-
 // The search results page for the app list.
 class APP_LIST_EXPORT SearchResultPageView
     : public AppListPage,
       public SearchResultContainerView::Delegate {
  public:
   SearchResultPageView();
   ~SearchResultPageView() override;
 
   int selected_index() { return selected_index_; }
   bool HasSelection() { return selected_index_ > -1; }
@@ skipping 35 matching lines @@
 
   // -1 indicates no selection.
   int selected_index_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchResultPageView);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_SEARCH_RESULT_PAGE_VIEW_H_