Revert of p1 mus+ash chrome renders ui and content

ui/views/mus/platform_window_mus.cc

Index: ui/views/mus/platform_window_mus.cc
diff --git a/ui/views/mus/platform_window_mus.cc b/ui/views/mus/platform_window_mus.cc
index 3a9c85f5623d466c8dc0568028fab0cae50d4032..be343eb045b9a15b9ef35f35ad4ecdc33a4292e0 100644
--- a/ui/views/mus/platform_window_mus.cc
+++ b/ui/views/mus/platform_window_mus.cc
@@ -13,11 +13,6 @@
 
 namespace views {
 
-namespace {
-static uint32_t accelerated_widget_count = 1;
-
-}  // namespace
-
 PlatformWindowMus::PlatformWindowMus(ui::PlatformWindowDelegate* delegate,
                                      mus::Window* mus_window)
     : delegate_(delegate),
@@ -28,18 +23,9 @@
   DCHECK(mus_window_);
   mus_window_->AddObserver(this);
 
-  // We need accelerated widget numbers to be different for each
-  // window and fit in the smallest sizeof(AcceleratedWidget) uint32_t
-  // has this property.
-#if defined(OS_WIN)
   delegate_->OnAcceleratedWidgetAvailable(
-      reinterpret_cast<gfx::AcceleratedWidget>(accelerated_widget_count++),
+      gfx::kNullAcceleratedWidget,
       mus_window_->viewport_metrics().device_pixel_ratio);
-#else
-  delegate_->OnAcceleratedWidgetAvailable(
-      static_cast<gfx::AcceleratedWidget>(accelerated_widget_count++),
-      mus_window_->viewport_metrics().device_pixel_ratio);
-#endif
 }
 
 PlatformWindowMus::~PlatformWindowMus() {