re-re-land of https://codereview.chromium.org/11364053/

ui/views/widget/native_widget_aura.cc

Index: ui/views/widget/native_widget_aura.cc
diff --git a/ui/views/widget/native_widget_aura.cc b/ui/views/widget/native_widget_aura.cc
index 7b30923c978484f2b4e2f77f056b14276eaa0e74..22fa7c9b23c813bc69fcd4cea3a8f62f8f849952 100644
--- a/ui/views/widget/native_widget_aura.cc
+++ b/ui/views/widget/native_widget_aura.cc
@@ -123,8 +123,8 @@ void NativeWidgetAura::InitNativeWidget(const Widget::InitParams& params) {
     // If the parent is not specified, find the default parent for
     // the |window_| using the desired |window_bounds|.
     if (!parent) {
-      parent = aura::client::GetStackingClient(params.GetParent())->
-          GetDefaultParent(window_, window_bounds);
+      parent = aura::client::GetStackingClient()->
+          GetDefaultParent(params.context, window_, window_bounds);
     } else if (window_bounds == gfx::Rect()) {
       // If a parent is specified but no bounds are given,
       // use the origin of the parent's display so that the widget