Adds ability for pre-target accelerators to not consume events

services/ui/demo/mus_demo.cc

Index: services/ui/demo/mus_demo.cc
diff --git a/services/ui/demo/mus_demo.cc b/services/ui/demo/mus_demo.cc
index ea9ff6062eb18e4639d42e8f9c7517647639f7d2..982399b682ffc6abdeca01e140aefeb1ef153bc6 100644
--- a/services/ui/demo/mus_demo.cc
+++ b/services/ui/demo/mus_demo.cc
@@ -126,10 +126,6 @@ void MusDemo::OnWmNewDisplay(ui::Window* window,
                base::Bind(&MusDemo::DrawFrame, base::Unretained(this)));
 }
 
-void MusDemo::OnAccelerator(uint32_t id, const ui::Event& event) {
-  // Don't care
-}
-
 void MusDemo::OnWmPerformMoveLoop(ui::Window* window,
                                   ui::mojom::MoveLoopSource source,
                                   const gfx::Point& cursor_location,