Add a window parameter to WindowDelegate's OnWindowDestroying/Destroyed methods.

This aligns this aspect of WindowDelegate with WindowObserver, that I hope to replace this part of WD with in the future. It also allows me to clean up a little bit of the DWTH/DNWA interaction (subsequent CL).

BUG=none
[email protected]

Review URL: https://codereview.chromium.org/183143006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253983 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/ui/aura/demo/demo_main.cc b/ui/aura/demo/demo_main.cc
index 6406ac51..b818663a 100644
--- a/ui/aura/demo/demo_main.cc
+++ b/ui/aura/demo/demo_main.cc
@@ -62,8 +62,8 @@
     canvas->DrawColor(color_, SkXfermode::kSrc_Mode);
   }
   virtual void OnDeviceScaleFactorChanged(float device_scale_factor) OVERRIDE {}
-  virtual void OnWindowDestroying() OVERRIDE {}
-  virtual void OnWindowDestroyed() OVERRIDE {}
+  virtual void OnWindowDestroying(aura::Window* window) OVERRIDE {}
+  virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE {}
   virtual void OnWindowTargetVisibilityChanged(bool visible) OVERRIDE {}
   virtual bool HasHitTestMask() const OVERRIDE { return false; }
   virtual void GetHitTestMask(gfx::Path* mask) const OVERRIDE {}