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

ash/aura/wm_shelf_aura.cc

Index: ash/aura/wm_shelf_aura.cc
diff --git a/ash/aura/wm_shelf_aura.cc b/ash/aura/wm_shelf_aura.cc
index 1effb10a78d4ea85720e992c9fb00742d712ec88..f6b925ea33c32d397c566b8a769d50a79edddd28 100644
--- a/ash/aura/wm_shelf_aura.cc
+++ b/ash/aura/wm_shelf_aura.cc
@@ -168,4 +168,8 @@ void WmShelfAura::OnShelfIconPositionsChanged() {
   FOR_EACH_OBSERVER(WmShelfObserver, observers_, OnShelfIconPositionsChanged());
 }
 
+void WmShelfAura::SetKeyboardBoundsForTesting(const gfx::Rect& bounds) {

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

nit: reorder to match decl

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

Done.

+  shelf_layout_manager_->OnKeyboardBoundsChanging(bounds);
+}
+
 }  // namespace ash