Deleted AppListViewDelegateObserver class (was unused).

ui/app_list/test/app_list_test_view_delegate.h

 // Copyright 2013 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_TEST_APP_LIST_TEST_VIEW_DELEGATE_H_
 #define UI_APP_LIST_TEST_APP_LIST_TEST_VIEW_DELEGATE_H_
 
 #include <stddef.h>
 
 #include <map>
@@ skipping 65 matching lines @@
   void ShowForProfileByPath(const base::FilePath& profile_path) override {}
 #if defined(TOOLKIT_VIEWS)
   views::View* CreateStartPageWebView(const gfx::Size& size) override;
   std::vector<views::View*> CreateCustomPageWebViews(
       const gfx::Size& size) override;
   void CustomLauncherPageAnimationChanged(double progress) override {}
   void CustomLauncherPagePopSubpage() override {}
 #endif
   bool IsSpeechRecognitionEnabled() override;
   const Users& GetUsers() const override;
-  void AddObserver(AppListViewDelegateObserver* observer) override;
-  void RemoveObserver(AppListViewDelegateObserver* observer) override;
 
   // Do a bulk replacement of the items in the model.
   void ReplaceTestModel(int item_count);
 
   AppListTestModel* ReleaseTestModel() { return model_.release(); }
   AppListTestModel* GetTestModel() { return model_.get(); }
 
  private:
   int dismiss_count_;
   int stop_speech_recognition_count_;
   int open_search_result_count_;
   int next_profile_app_count_;
   std::map<size_t, int> open_search_result_counts_;
   Users users_;
   std::unique_ptr<AppListTestModel> model_;
-  base::ObserverList<AppListViewDelegateObserver> observers_;
   SpeechUIModel speech_ui_;
   base::TimeDelta auto_launch_timeout_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListTestViewDelegate);
 };
 
 }  // namespace test
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_TEST_APP_LIST_TEST_VIEW_DELEGATE_H_