Replace ShelfItemDelegate::GetTitle() with ShelfItem::title.

ash/common/test/test_shelf_item_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 "ash/common/test/test_shelf_item_delegate.h"
 
 #include "ash/common/wm_window.h"
 
 namespace ash {
 namespace test {
 
 TestShelfItemDelegate::TestShelfItemDelegate(WmWindow* window)
     : window_(window) {}
 
 TestShelfItemDelegate::~TestShelfItemDelegate() {}
 
 ShelfItemDelegate::PerformedAction TestShelfItemDelegate::ItemSelected(
     const ui::Event& event) {
   if (window_) {
     if (window_->GetType() == ui::wm::WINDOW_TYPE_PANEL)
       window_->MoveToEventRoot(event);
     window_->Show();
     window_->Activate();
     return kExistingWindowActivated;
   }
   return kNoAction;
 }
 
-base::string16 TestShelfItemDelegate::GetTitle() {
-  return window_ ? window_->GetTitle() : base::string16();
-}
-
 ShelfMenuModel* TestShelfItemDelegate::CreateApplicationMenu(int event_flags) {
   return nullptr;
 }
 
 void TestShelfItemDelegate::Close() {}
 
 }  // namespace test
 }  // namespace ash