aura: Defer OutputSurface creation until widget is available

ui/compositor/test/test_compositor_host_ozone.cc

Index: ui/compositor/test/test_compositor_host_ozone.cc
diff --git a/ui/compositor/test/test_compositor_host_ozone.cc b/ui/compositor/test/test_compositor_host_ozone.cc
index 933c0cb56bed221147994dd4ad393b678ab7547a..b7f9d004cc527ff19fc7029e8b51925d1e38b7f9 100644
--- a/ui/compositor/test/test_compositor_host_ozone.cc
+++ b/ui/compositor/test/test_compositor_host_ozone.cc
@@ -53,7 +53,7 @@ void TestCompositorHostOzone::Show() {
   // with a non-0 widget.
   // TODO(rjkroege): Use a "real" ozone widget when it is
   // available: http://crbug.com/255128
-  compositor_.SetAcceleratedWidgetAndStartCompositor(1);
+  compositor_.SetAcceleratedWidget(1);
   compositor_.SetScaleAndSize(1.0f, bounds_.size());
 }