Use app list item shadow for app list folders.

ash/shell/app_list.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 <string>
 #include <vector>
 
 #include "ash/session/session_state_delegate.h"
 #include "ash/shell.h"
 #include "ash/shell/example_factory.h"
@@ skipping 126 matching lines @@
 
  private:
   Type type_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowTypeShelfItem);
 };
 
 WindowTypeShelfItem::WindowTypeShelfItem(const std::string& id, Type type)
     : app_list::AppListItem(id), type_(type) {
   std::string title(GetTitle(type));
-  SetIcon(GetIcon(type), false);
+  SetIcon(GetIcon(type));
   SetName(title);
 }
 
 WindowTypeShelfItem::~WindowTypeShelfItem() {
 }
 
 // ExampleSearchResult is an app list search result. It provides what icon to
 // show, what should title and details text look like. It also carries the
 // matching window launch type so that AppListViewDelegate knows how to open
 // it.
@@ skipping 205 matching lines @@
 };
 
 }  // namespace
 
 app_list::AppListViewDelegate* CreateAppListViewDelegate() {
   return new ExampleAppListViewDelegate;
 }
 
 }  // namespace shell
 }  // namespace ash