Refactor LauncherDelegate

ash/test/test_launcher_delegate.cc

 // 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.
 
 #include "ash/test/test_launcher_delegate.h"
 
 #include "ash/launcher/launcher_model.h"
 #include "ash/launcher/launcher_util.h"
 #include "ash/wm/window_util.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 127 matching lines @@
 void TestLauncherDelegate::PinAppWithID(const std::string& app_id) {
 }
 
 bool TestLauncherDelegate::IsAppPinned(const std::string& app_id) {
   return false;
 }
 
 void TestLauncherDelegate::UnpinAppsWithID(const std::string& app_id) {
 }
 
+LauncherItemDelegate* TestLauncherDelegate::GetLauncherItemDelegate(
+    const LauncherItem& item) {
+  return this;
+}
+
 }  // namespace test
 }  // namespace ash