Make RootWindow not subclass Window.

Removes the #include of window.h from root_window.h too, which makes this CL a little longer bandaiding all those places.
The interesting parts of this change are in root_window.* and window.*

[email protected]
http://crbug.com/308843

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=234428

Review URL: https://codereview.chromium.org/68313003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234634 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/ash/root_window_controller.h b/ash/root_window_controller.h
index 980bf1e..0ccc1d3 100644
--- a/ash/root_window_controller.h
+++ b/ash/root_window_controller.h
@@ -14,6 +14,7 @@
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/aura/root_window.h"
+#include "ui/aura/window.h"
 #include "ui/base/ui_base_types.h"
 
 class SkBitmap;