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/mus/public/cpp/window.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
@@ skipping 20 matching lines @@
 #if defined(OS_WIN) || defined(OS_ANDROID)
   gfx::AcceleratedWidget accelerated_widget =
       reinterpret_cast<gfx::AcceleratedWidget>(accelerated_widget_count++);
 #else
   gfx::AcceleratedWidget accelerated_widget =
       static_cast<gfx::AcceleratedWidget>(accelerated_widget_count++);
 #endif
   // TODO(markdittmer): Use correct device-scale-factor from |window|.
   OnAcceleratedWidgetAvailable(accelerated_widget, 1.f);
 
-  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