Deleted AppListViewDelegateObserver class (was unused).

ui/app_list/views/app_list_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_APP_LIST_VIEW_H_
 #define UI_APP_LIST_VIEWS_APP_LIST_VIEW_H_
 
 #include <memory>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "build/build_config.h"
 #include "ui/app_list/app_list_export.h"
-#include "ui/app_list/app_list_view_delegate_observer.h"
 #include "ui/app_list/speech_ui_model_observer.h"
 #include "ui/views/bubble/bubble_dialog_delegate.h"
 #include "ui/views/widget/widget.h"
 
 namespace base {
 class FilePath;
 }
 
 namespace views {
 class ImageView;
@@ skipping 10 matching lines @@
 class SearchBoxView;
 class SpeechView;
 
 namespace test {
 class AppListViewTestApi;
 }
 
 // AppListView is the top-level view and controller of app list UI. It creates
 // and hosts a AppsGridView and passes AppListModel to it for display.
 class APP_LIST_EXPORT AppListView : public views::BubbleDialogDelegateView,
-                                    public AppListViewDelegateObserver,
                                     public SpeechUIModelObserver {
  public:
   // Does not take ownership of |delegate|.
   explicit AppListView(AppListViewDelegate* delegate);
   ~AppListView() override;
 
   // Initializes the widget and use a fixed |anchor_point_in_screen| for
   // positioning.
   void InitAsBubbleAtFixedLocation(gfx::NativeView parent,
                                    int initial_apps_page,
@@ skipping 34 matching lines @@
   // Overridden from views::View:
   gfx::Size GetPreferredSize() const override;
   void OnPaint(gfx::Canvas* canvas) override;
 
   // WidgetDelegate overrides:
   bool ShouldHandleSystemCommands() const override;
   bool ShouldDescendIntoChildForEventHandling(
       gfx::NativeView child,
       const gfx::Point& location) override;
 
-  // Overridden from AppListViewDelegateObserver:
-  void OnShutdown() override;
-
   void SetProfileByPath(const base::FilePath& profile_path);
 
   void AddObserver(AppListViewObserver* observer);
   void RemoveObserver(AppListViewObserver* observer);
 
   AppListMainView* app_list_main_view() { return app_list_main_view_; }
 
   // Gets the PaginationModel owned by this view's apps grid.
   PaginationModel* GetAppsPaginationModel();
 
@@ skipping 52 matching lines @@
 
   // For UMA and testing. If non-null, triggered when the app list is painted.
   base::Closure next_paint_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListView);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_APP_LIST_VIEW_H_