Move more from Window onto Widget.

views/mouse_watcher.cc

Index: views/mouse_watcher.cc
===================================================================
--- views/mouse_watcher.cc	(revision 88218)
+++ views/mouse_watcher.cc	(working copy)
@@ -96,12 +96,12 @@
 
   // Returns true if the mouse is over the view's window.
   bool IsMouseOverWindow() {
-    Window* window = view()->GetWindow();
-    if (!window)
+    Widget* widget = view()->GetWidget();
+    if (!widget)
       return false;
 
     return Screen::GetWindowAtCursorScreenPoint() ==
-        window->GetNativeWindow();
+        widget->GetNativeWindow();
   }
 
   // Called from the message loop observer when a mouse movement has occurred.