MacViews: Changes to allow app_list_unittests to compile

ui/app_list/views/app_list_main_view_unittest.cc

Index: ui/app_list/views/app_list_main_view_unittest.cc
diff --git a/ui/app_list/views/app_list_main_view_unittest.cc b/ui/app_list/views/app_list_main_view_unittest.cc
index 5ccd17e7982bd4c5890aad04a58e19184b51a3a8..625a86c2519336f12215bae39906d495be1d1937 100644
--- a/ui/app_list/views/app_list_main_view_unittest.cc
+++ b/ui/app_list/views/app_list_main_view_unittest.cc
@@ -73,7 +73,10 @@ class AppListMainViewTest : public views::ViewsTestBase {
     views::ViewsTestBase::SetUp();
     delegate_.reset(new AppListTestViewDelegate);
 
-    main_view_ = new AppListMainView(delegate_.get(), 0, GetContext());
+    // In Ash, the third argument is a container aura::Window, but it is always
+    // NULL on Windows, and not needed for tests. It is only used to determine
+    // the scale factor for preloading icons.
+    main_view_ = new AppListMainView(delegate_.get(), 0, NULL);
     main_view_->SetPaintToLayer(true);
     main_view_->model()->SetFoldersEnabled(true);