Delete mus surfaces hit testing

components/mus/ws/platform_display.cc

 // Copyright 2014 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.
 
 #include "components/mus/ws/platform_display.h"
 
 #include "base/numerics/safe_conversions.h"
 #include "build/build_config.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/copy_output_request.h"
@@ skipping 405 matching lines @@
   delegate_->OnNativeCaptureLost();
 }
 
 void DefaultPlatformDisplay::OnAcceleratedWidgetAvailable(
     gfx::AcceleratedWidget widget,
     float device_pixel_ratio) {
   if (widget != gfx::kNullAcceleratedWidget) {
     display_compositor_.reset(
         new DisplayCompositor(base::ThreadTaskRunnerHandle::Get(), widget,
                               gpu_state_, surfaces_state_));
-    delegate_->OnTopLevelSurfaceChanged(display_compositor_->surface_id());
   }
   UpdateMetrics(metrics_.size_in_pixels.To<gfx::Size>(), device_pixel_ratio);
 }
 
 void DefaultPlatformDisplay::OnAcceleratedWidgetDestroyed() {
   NOTREACHED();
 }
 
 void DefaultPlatformDisplay::OnActivationChanged(bool active) {}
 
 void DefaultPlatformDisplay::RequestCopyOfOutput(
     std::unique_ptr<cc::CopyOutputRequest> output_request) {
   if (display_compositor_)
     display_compositor_->RequestCopyOfOutput(std::move(output_request));
 }
 
 }  // namespace ws
 
 }  // namespace mus