Attempt 2 at: Fixes crash that occured because NativeViewHostAura::Detach was not

ui/views/controls/native/native_view_host.h

Index: ui/views/controls/native/native_view_host.h
diff --git a/ui/views/controls/native/native_view_host.h b/ui/views/controls/native/native_view_host.h
index 4aa3d85854029625bce51b66065eb2adba19a629..d0adf6cd83cec51fe8c87bc0b68f597253241c2b 100644
--- a/ui/views/controls/native/native_view_host.h
+++ b/ui/views/controls/native/native_view_host.h
@@ -95,6 +95,11 @@ class VIEWS_EXPORT NativeViewHost : public View {
   // detached because it's being destroyed, or false otherwise.
   void Detach(bool destroyed);
 
+  // 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();
+
   // The attached native view. There is exactly one native_view_ attached.
   gfx::NativeView native_view_;