mash: Convert all of //ash/system to use WmShelf

ash/shelf/shelf_layout_manager.h

Index: ash/shelf/shelf_layout_manager.h
diff --git a/ash/shelf/shelf_layout_manager.h b/ash/shelf/shelf_layout_manager.h
index 9af25e391b0cd5e3a906edc0d49b3ea0f2690893..732fbeda31114207cf217b354d2024c362bafab5 100644
--- a/ash/shelf/shelf_layout_manager.h
+++ b/ash/shelf/shelf_layout_manager.h
@@ -210,6 +210,7 @@ class ASH_EXPORT ShelfLayoutManager
   friend class PanelLayoutManagerTest;
   friend class ShelfLayoutManagerTest;
   friend class ToastManagerTest;
+  friend class WmShelfAura;

[James Cook, 2016/06/24 23:20:08]

For OnKeyboardBoundsChanging(), and I suspect a few more things in the future.

[msw, 2016/06/25 00:18:29]

Maybe move that to public or something like shelf_test_api.h?
Maybe tests should call KeyboardController::NotifyKeyboardBoundsChanging?

[James Cook, 2016/06/25 01:20:58]

Moved it to public and reordered definition in .cc. I didn't use
shelf_test_api.h because I didn't want to worry about GN's testonly code vs.
ForTesting() in WmShelf. Maybe in the future we can create a WmShelfTestApi if
WmShelf grows too many test methods.

As mentioned offline I didn't have much luck in making the test use
KeyboardController directly.

   FRIEND_TEST_ALL_PREFIXES(ash::AshPopupAlignmentDelegateTest, AutoHide);
   FRIEND_TEST_ALL_PREFIXES(ash::WebNotificationTrayTest, PopupAndFullscreen);