chromeos: moves more ash tests to run on mash

ash/shelf/shelf_layout_manager_unittest.cc

Index: ash/shelf/shelf_layout_manager_unittest.cc
diff --git a/ash/shelf/shelf_layout_manager_unittest.cc b/ash/shelf/shelf_layout_manager_unittest.cc
index 1fde860b9e286872ffdedd0c5c4532eeddf8acdf..64983c19691a07821ed187dd228b45f5d3e0ae0d 100644
--- a/ash/shelf/shelf_layout_manager_unittest.cc
+++ b/ash/shelf/shelf_layout_manager_unittest.cc
@@ -752,6 +752,8 @@ TEST_F(ShelfLayoutManagerTest, AutoHideShelfOnScreenBoundary) {
     return;
 
   UpdateDisplay("800x600,800x600");
+  // TODO: SetLayoutForCurrentDisplays() needs to ported to mash.
+  // http://crbug.com/698043.
   Shell::GetInstance()->display_manager()->SetLayoutForCurrentDisplays(
       display::test::CreateDisplayLayout(display_manager(),
                                          display::DisplayPlacement::RIGHT, 0));