Ignore fullscreen windows which are behind other windows for fullscreen mode.

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 e9615a8fcf0b329795671b4e598221e1569f0b01..5d0496b8f9bc5b8c327d79e235fdcc6cc19bf50b 100644
--- a/ash/shelf/shelf_layout_manager.h
+++ b/ash/shelf/shelf_layout_manager.h
@@ -215,10 +215,6 @@ class ASH_EXPORT ShelfLayoutManager :
   // Is the shelf's alignment horizontal?
   bool IsHorizontalAlignment() const;
 
-  // Returns true if there is a fullscreen window and the shelf needs to be
-  // hidden for the topmost fullscreen window.
-  bool FullscreenWithHiddenShelf() const;
-
   // Returns a ShelfLayoutManager on the display which has a launcher for
   // given |window|. See RootWindowController::ForLauncher for more info.
   static ShelfLayoutManager* ForLauncher(aura::Window* window);