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

ash/root_window_controller.cc

Index: ash/root_window_controller.cc
diff --git a/ash/root_window_controller.cc b/ash/root_window_controller.cc
index cd3ecdfc7c5c54c558a089e2da9a241551528eec..7e198151f0232da097246031f7ba00eeffa2e595 100644
--- a/ash/root_window_controller.cc
+++ b/ash/root_window_controller.cc
@@ -198,10 +198,8 @@ class EmptyWindowDelegate : public aura::WindowDelegate {
     return false;
   }
   virtual void GetHitTestMask(gfx::Path* mask) const OVERRIDE {}
-  virtual scoped_refptr<ui::Texture> CopyTexture() OVERRIDE {
-    NOTREACHED();
-    return scoped_refptr<ui::Texture>();
-  }
+  virtual void DidRecreateLayer(ui::Layer* old_layer,
+                                ui::Layer* new_layer) OVERRIDE {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(EmptyWindowDelegate);