cros: CustomFrameViewAsh avatar icon from a window prop

ash/mus/non_client_frame_controller.cc

Index: ash/mus/non_client_frame_controller.cc
diff --git a/ash/mus/non_client_frame_controller.cc b/ash/mus/non_client_frame_controller.cc
index 3e9d1841c156e6d064e645409ac4d4b0da53f6a8..4c90f6c612799a5bc1fd1dbbe33f57f5f26bf8ed 100644
--- a/ash/mus/non_client_frame_controller.cc
+++ b/ash/mus/non_client_frame_controller.cc
@@ -213,7 +213,7 @@ class WmNativeWidgetAura : public views::NativeWidgetAura {
     // marked as transparent content (see below in NonClientFrameController()
     // ctor). So, it is necessary to provide a texture-layer for the header
     // view.
-    views::View* header_view = custom_frame_view_->header_view();
+    views::View* header_view = custom_frame_view_->GetHeaderView();
     header_view->SetPaintToLayer(ui::LAYER_TEXTURED);
     header_view->layer()->SetFillsBoundsOpaquely(false);