Drop unnecessary override of OnWindowBoundsChanged in NativeWidgetMus::MusWindowObserver

ui/views/mus/window_tree_host_mus.cc

 // 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.
 
 #include "ui/views/mus/window_tree_host_mus.h"
 
 #include "base/memory/ptr_util.h"
 #include "components/bitmap_uploader/bitmap_uploader.h"
 #include "components/mus/public/cpp/window.h"
 #include "ui/aura/window.h"
@@ skipping 35 matching lines @@
   // example, in some unit test contexts.
   if (connector) {
     bitmap_uploader_.reset(new bitmap_uploader::BitmapUploader(window));
     bitmap_uploader_->Init(connector);
     prop_.reset(
         new ui::ViewProp(accelerated_widget,
                          bitmap_uploader::kBitmapUploaderForAcceleratedWidget,
                          bitmap_uploader_.get()));
   }
 
-  SetPlatformWindow(base::WrapUnique(new ui::StubWindow(nullptr)));
+  SetPlatformWindow(base::WrapUnique(new ui::StubWindow(
+      this,
+      false)));  // Do not advertise accelerated widget; already set manually.
+
   // Initialize the stub platform window bounds to those of the mus::Window.
   platform_window()->SetBounds(window->bounds());
 
   // The location of events is already transformed, and there is no way to
   // correctly determine the reverse transform. So, don't attempt to transform
   // event locations, else the root location is wrong.
   // TODO(sky): we need to transform for device scale though.
   dispatcher()->set_transform_events(false);
   compositor()->SetHostHasTransparentBackground(true);
 
@@ skipping 28 matching lines @@
   if (native_widget_)
     native_widget_->OnActivationChanged(active);
   WindowTreeHostPlatform::OnActivationChanged(active);
 }
 
 void WindowTreeHostMus::OnCloseRequest() {
   OnHostCloseRequested();
 }
 
 }  // namespace views