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

Source/core/dom/MainThreadTaskRunnerTest.cpp

Index: Source/core/dom/MainThreadTaskRunnerTest.cpp
diff --git a/Source/core/dom/MainThreadTaskRunnerTest.cpp b/Source/core/dom/MainThreadTaskRunnerTest.cpp
index ca1779947a402aaf2fae52c4355baa169c713348..67a445decf01b048ff8959f7911084ba1c05f7b1 100644
--- a/Source/core/dom/MainThreadTaskRunnerTest.cpp
+++ b/Source/core/dom/MainThreadTaskRunnerTest.cpp
@@ -42,7 +42,7 @@ class NullEventQueue : public EventQueue {
 public:
     NullEventQueue() { }
     virtual ~NullEventQueue() { }
-    virtual bool enqueueEvent(PassRefPtr<Event>) OVERRIDE { return true; }
+    virtual bool enqueueEvent(PassRefPtrWillBeRawPtr<Event>) OVERRIDE { return true; }
     virtual bool cancelEvent(Event*) OVERRIDE { return true; }
     virtual void close() OVERRIDE { }
 };