Drop unnecessary override of OnWindowBoundsChanged in NativeWidgetMus::MusWindowObserver

ui/views/mus/window_tree_host_mus.cc

Index: ui/views/mus/window_tree_host_mus.cc
diff --git a/ui/views/mus/window_tree_host_mus.cc b/ui/views/mus/window_tree_host_mus.cc
index dcf8b81f683289fe398bd23644f79efdf7e19422..2105f56bd7a53eb658d0f985817733c844751f68 100644
--- a/ui/views/mus/window_tree_host_mus.cc
+++ b/ui/views/mus/window_tree_host_mus.cc
@@ -53,7 +53,10 @@ WindowTreeHostMus::WindowTreeHostMus(shell::Connector* connector,
                          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());