Makes NativeViewHostWin change the parent of the hwnd when

ui/views/controls/native/native_view_host_win.h

Index: ui/views/controls/native/native_view_host_win.h
diff --git a/ui/views/controls/native/native_view_host_win.h b/ui/views/controls/native/native_view_host_win.h
index bf0cc247fef5f0a47eb2c7a7193cb8f1e7f026ac..4d41c23fa60d5f3696c418cb93472edee0ae8285 100644
--- a/ui/views/controls/native/native_view_host_win.h
+++ b/ui/views/controls/native/native_view_host_win.h
@@ -32,6 +32,11 @@ class NativeViewHostWin : public NativeViewHostWrapper {
   virtual gfx::NativeViewAccessible GetNativeViewAccessible();
 
  private:
+  // Invokes ViewRemoved() on the FocusManager for all the child Widgets of our
+  // NativeView. This is used when detaching to ensure the FocusManager doesn't
+  // have a reference to a View that is no longer reachable.
+  void ClearFocus();
+
   // Our associated NativeViewHost.
   NativeViewHost* host_;