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

ui/events/event_rewriter_unittest.cc

Index: ui/events/event_rewriter_unittest.cc
diff --git a/ui/events/event_rewriter_unittest.cc b/ui/events/event_rewriter_unittest.cc
index 73cad4406f436de9e9049739e675f8a08dd1a911..8683e38f283d93e6bf7392be07265730bf7041bc 100644
--- a/ui/events/event_rewriter_unittest.cc
+++ b/ui/events/event_rewriter_unittest.cc
@@ -63,10 +63,10 @@ class TestEventRewriteSource : public EventSource {
  public:
   explicit TestEventRewriteSource(EventProcessor* processor)
       : processor_(processor) {}
-  EventProcessor* GetEventProcessor() override { return processor_; }
+  EventProcessor* GetEventSink() override { return processor_; }
   void Send(EventType type) {
     std::unique_ptr<Event> event(new TestEvent(type));
-    (void)SendEventToProcessor(event.get());
+    ignore_result(SendEventToSink(event.get()));
   }
 
  private: