Oilpan: Replace most of RefPtrs for Event objects with oilpan's transition types

Source/core/events/KeyboardEvent.h

Index: Source/core/events/KeyboardEvent.h
diff --git a/Source/core/events/KeyboardEvent.h b/Source/core/events/KeyboardEvent.h
index 5bf8c15bd167e18acbe06603f13a1be8ae4cffe8..c5f956daa7c370ac736465eb4e45ef2b5844dad9 100644
--- a/Source/core/events/KeyboardEvent.h
+++ b/Source/core/events/KeyboardEvent.h
@@ -119,9 +119,9 @@ private:
 
 class KeyboardEventDispatchMediator : public EventDispatchMediator {
 public:
-    static PassRefPtr<KeyboardEventDispatchMediator> create(PassRefPtr<KeyboardEvent>);
+    static PassRefPtr<KeyboardEventDispatchMediator> create(PassRefPtrWillBeRawPtr<KeyboardEvent>);
 private:
-    explicit KeyboardEventDispatchMediator(PassRefPtr<KeyboardEvent>);
+    explicit KeyboardEventDispatchMediator(PassRefPtrWillBeRawPtr<KeyboardEvent>);
     virtual bool dispatchEvent(EventDispatcher*) const OVERRIDE;
 };