mustash: Use ui::chromeos::EventRewriter in mus

ui/aura/test/aura_test_base.h

Index: ui/aura/test/aura_test_base.h
diff --git a/ui/aura/test/aura_test_base.h b/ui/aura/test/aura_test_base.h
index 41d084e9eaec94e60ca768b84fec2c8e8798a03d..d2a7b6fd443fe3eee14ad31354a39b26d35b585f 100644
--- a/ui/aura/test/aura_test_base.h
+++ b/ui/aura/test/aura_test_base.h
@@ -78,7 +78,7 @@ class AuraTestBase : public testing::Test,
 
   Window* root_window() { return helper_->root_window(); }
   WindowTreeHost* host() { return helper_->host(); }
-  ui::EventProcessor* event_processor() { return helper_->event_processor(); }
+  ui::EventSink* event_sink() { return helper_->event_sink(); }
   TestScreen* test_screen() { return helper_->test_screen(); }
 
   TestWindowTree* window_tree() { return helper_->window_tree(); }