Revert of Improves focus/activation for aura-mus and DesktopNativeWidgetAura

ui/aura/test/aura_test_base.cc

Index: ui/aura/test/aura_test_base.cc
diff --git a/ui/aura/test/aura_test_base.cc b/ui/aura/test/aura_test_base.cc
index 9588711707f68f6405467cd1ba7fdc5cb72744f5..2af73e871456e967df37a9f496f1d7b52a32feb8 100644
--- a/ui/aura/test/aura_test_base.cc
+++ b/ui/aura/test/aura_test_base.cc
@@ -232,6 +232,10 @@
 
 void AuraTestBase::OnWmCancelMoveLoop(Window* window) {}
 
+client::FocusClient* AuraTestBase::GetFocusClient() {
+  return helper_->focus_client();
+}
+
 client::CaptureClient* AuraTestBase::GetCaptureClient() {
   return helper_->capture_client();
 }