Moves Shell::ShowShelf() to WmShell

ash/common/wm_root_window_controller.h

Index: ash/common/wm_root_window_controller.h
diff --git a/ash/common/wm_root_window_controller.h b/ash/common/wm_root_window_controller.h
index 958fd6ae6cf2ee030cd1bc950b09b995f397b0a2..f052c1cc4c70909d7f9860568a4082dd98a1c6da 100644
--- a/ash/common/wm_root_window_controller.h
+++ b/ash/common/wm_root_window_controller.h
@@ -94,6 +94,10 @@ class ASH_EXPORT WmRootWindowController {
 
   virtual WmShelf* GetShelf() = 0;
 
+  // Show shelf view if it was created hidden (before session has started).
+  // TODO(jamescook): Eliminate this and handle show via Shelf.
+  void ShowShelf();
+
   // Returns the window associated with this WmRootWindowController.
   virtual WmWindow* GetWindow() = 0;