Deleted AppListViewDelegateObserver class (was unused).

ui/app_list/test/app_list_test_view_delegate.cc

 // 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.
 
 #include "ui/app_list/test/app_list_test_view_delegate.h"
 
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "ui/app_list/app_list_model.h"
 #include "ui/app_list/app_list_switches.h"
-#include "ui/app_list/app_list_view_delegate_observer.h"
 #include "ui/app_list/test/app_list_test_model.h"
 #include "ui/gfx/image/image_skia.h"
 
 namespace app_list {
 namespace test {
 
 AppListTestViewDelegate::AppListTestViewDelegate()
     : dismiss_count_(0),
       stop_speech_recognition_count_(0),
       open_search_result_count_(0),
@@ skipping 73 matching lines @@
 
 const AppListViewDelegate::Users& AppListTestViewDelegate::GetUsers() const {
   return users_;
 }
 
 void AppListTestViewDelegate::ReplaceTestModel(int item_count) {
   model_.reset(new AppListTestModel);
   model_->PopulateApps(item_count);
 }
 
-void AppListTestViewDelegate::AddObserver(
-    AppListViewDelegateObserver* observer) {
-  observers_.AddObserver(observer);
-}
-
-void AppListTestViewDelegate::RemoveObserver(
-    AppListViewDelegateObserver* observer) {
-  observers_.RemoveObserver(observer);
-}
-
 }  // namespace test
 }  // namespace app_list