Use app list item shadow for app list folders.

ui/app_list/test/app_list_test_model.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_model.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/stringprintf.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/app_list/app_list_constants.h"
@@ skipping 12 matching lines @@
 // static
 const char AppListTestModel::kItemType[] = "TestItem";
 
 // AppListTestModel::AppListTestItem
 
 AppListTestModel::AppListTestItem::AppListTestItem(
     const std::string& id,
     AppListTestModel* model)
     : AppListItem(id),
       model_(model) {
-  SetIcon(CreateImageSkia(kGridIconDimension, kGridIconDimension),
-          false /* has_shadow */);
+  SetIcon(CreateImageSkia(kGridIconDimension, kGridIconDimension));
 }
 
 AppListTestModel::AppListTestItem::~AppListTestItem() {
 }
 
 void AppListTestModel::AppListTestItem::Activate(int event_flags) {
   model_->ItemActivated(this);
 }
 
 const char* AppListTestModel::AppListTestItem::GetItemType() const {
@@ skipping 109 matching lines @@
   top_level_item_list()->HighlightItemInstalledFromUI(item->id());
 }
 
 void AppListTestModel::ItemActivated(AppListTestItem* item) {
   last_activated_ = item;
   ++activate_count_;
 }
 
 }  // namespace test
 }  // namespace app_list