Delete mus surfaces hit testing

components/mus/ws/platform_display_delegate.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_MUS_WS_PLATFORM_DISPLAY_DELEGATE_H_
 #define COMPONENTS_MUS_WS_PLATFORM_DISPLAY_DELEGATE_H_
 
 #include "components/mus/public/interfaces/window_tree.mojom.h"
 #include "components/mus/ws/ids.h"
 
-namespace cc {
-struct SurfaceId;
-}
-
 namespace ui {
 class Event;
 }
 
 namespace mus {
 
 namespace ws {
 
 class ServerWindow;
 
@@ skipping 12 matching lines @@
   virtual void OnEvent(const ui::Event& event) = 0;
 
   // Called when the Display loses capture.
   virtual void OnNativeCaptureLost() = 0;
 
   // Signals that the metrics of this display's viewport has changed.
   virtual void OnViewportMetricsChanged(
       const mojom::ViewportMetrics& old_metrics,
       const mojom::ViewportMetrics& new_metrics) = 0;
 
-  virtual void OnTopLevelSurfaceChanged(cc::SurfaceId surface_id) = 0;
-
   // Called when a compositor frame is finished drawing.
   virtual void OnCompositorFrameDrawn() = 0;
 
  protected:
   virtual ~PlatformDisplayDelegate() {}
 };
 
 }  // namespace ws
 
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_WS_PLATFORM_DISPLAY_DELEGATE_H_