Move the content-dependent RecreateLayer logic from aura::Window to RWHVA

ui/views/widget/native_widget_aura.cc

Index: ui/views/widget/native_widget_aura.cc
diff --git a/ui/views/widget/native_widget_aura.cc b/ui/views/widget/native_widget_aura.cc
index 86012a5b5c49a84a21366e22678f38dd30a5b3ea..9de9072f9f3733ced2418435c796b8c8abcfa8a1 100644
--- a/ui/views/widget/native_widget_aura.cc
+++ b/ui/views/widget/native_widget_aura.cc
@@ -804,11 +804,8 @@ void NativeWidgetAura::GetHitTestMask(gfx::Path* mask) const {
   delegate_->GetHitTestMask(mask);
 }
 
-scoped_refptr<ui::Texture> NativeWidgetAura::CopyTexture() {
-  // The layer we create doesn't have an external texture, so this should never
-  // get invoked.
-  NOTREACHED();
-  return scoped_refptr<ui::Texture>();
+void NativeWidgetAura::DidRecreateLayer(ui::Layer *old_layer,
+                                        ui::Layer *new_layer) {
 }
 
 ////////////////////////////////////////////////////////////////////////////////