Use app list item shadow for app list folders.

ui/app_list/folder_image_unittest.cc

 // Copyright 2014 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 "ui/app_list/folder_image.h"
 
 #include "base/macros.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 56 matching lines @@
 
     observer_.Reset();
     folder_image_.AddObserver(&observer_);
   }
 
   void TearDown() override { folder_image_.RemoveObserver(&observer_); }
 
  protected:
   void AddAppWithColoredIcon(const std::string& id, SkColor icon_color) {
     scoped_ptr<AppListItem> item(new AppListItem(id));
-    item->SetIcon(CreateSquareBitmapWithColor(kListIconSize, icon_color),
-                  false);
+    item->SetIcon(CreateSquareBitmapWithColor(kListIconSize, icon_color));
     app_list_model_.AddItem(item.Pass());
   }
 
   AppListModel app_list_model_;
 
   FolderImage folder_image_;
 
   TestFolderImageObserver observer_;
 
  private:
@@ skipping 42 matching lines @@
   EXPECT_TRUE(observer_.updated());
   observer_.Reset();
   gfx::ImageSkia icon4 = folder_image_.icon();
   EXPECT_FALSE(ImagesAreEqual(icon3, icon4));
 }
 
 TEST_F(FolderImageTest, UpdateItemTest) {
   gfx::ImageSkia icon1 = folder_image_.icon();
 
   // Change an item's icon. Ensure that the observer fired and the icon changed.
-  app_list_model_.FindItem("app2")->SetIcon(
-      CreateSquareBitmapWithColor(kListIconSize, SK_ColorMAGENTA), false);
+  app_list_model_.FindItem("app2")
+      ->SetIcon(CreateSquareBitmapWithColor(kListIconSize, SK_ColorMAGENTA));
   EXPECT_TRUE(observer_.updated());
   observer_.Reset();
   EXPECT_FALSE(ImagesAreEqual(icon1, folder_image_.icon()));
 }
 
 }  // namespace app_list