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

chrome/browser/ui/webui/chromeos/login/core_oobe_handler.h

Index: chrome/browser/ui/webui/chromeos/login/core_oobe_handler.h
diff --git a/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.h b/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.h
index 4b07340a7904718326c20fe5b7813c18783e5b3b..cdf33b603408055a0cf1f12ba750098d2270730c 100644
--- a/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.h
+++ b/chrome/browser/ui/webui/chromeos/login/core_oobe_handler.h
@@ -25,7 +25,7 @@ class ListValue;
 }
 
 namespace ui {
-class EventProcessor;
+class EventSink;
 }
 
 namespace chromeos {
@@ -58,7 +58,7 @@ class CoreOobeHandler : public BaseWebUIHandler,
                                const std::string& asset_id) override;
 
   // ui::EventSource implementation:
-  ui::EventProcessor* GetEventProcessor() override;
+  ui::EventSink* GetEventSink() override;
 
   // Show or hide OOBE UI.
   void ShowOobeUI(bool show);