Changes views_aura_mus_unittests to create DesktopNativeWidgetAura

ui/views/focus/focus_manager_unittest.cc

Index: ui/views/focus/focus_manager_unittest.cc
diff --git a/ui/views/focus/focus_manager_unittest.cc b/ui/views/focus/focus_manager_unittest.cc
index a655eafcc45e0c3d37abf43989a3f78704fc6db0..b2ed4dc2af1c7a200a63ebb347f267fca09b4cc2 100644
--- a/ui/views/focus/focus_manager_unittest.cc
+++ b/ui/views/focus/focus_manager_unittest.cc
@@ -122,6 +122,12 @@ TEST_F(FocusManagerTest, FocusChangeListener) {
 }
 
 TEST_F(FocusManagerTest, WidgetFocusChangeListener) {
+  // TODO: this test ends up calling focus on the aura::Window associated with
+  // the Widget and expecting that to change acivation. This should work for

[msw, 2016/11/11 00:29:24]

nit: activation

[sky, 2016/11/11 01:09:13]

Done.

+  // aura-mus-client as well. http://crbug.com/664261.
+  if (IsAuraMusClient())
+    return;
+
   // First, ensure the simulator is aware of the Widget created in SetUp() being
   // currently active.
   test::WidgetTest::SimulateNativeActivate(GetWidget());