Oilpan: Remove ref counting from EventTarget and all uses of Pass/RefPtr<EventTarget>.

Source/core/events/GenericEventQueue.cpp

Index: Source/core/events/GenericEventQueue.cpp
diff --git a/Source/core/events/GenericEventQueue.cpp b/Source/core/events/GenericEventQueue.cpp
index cc84fc36ca1454109d26d6d80ca2f5b7281b9245..7f4386ac4e090e5f67f5d719eae73ffde0c1ad74 100644
--- a/Source/core/events/GenericEventQueue.cpp
+++ b/Source/core/events/GenericEventQueue.cpp
@@ -88,7 +88,7 @@ void GenericEventQueue::timerFired(Timer<GenericEventQueue>*)
     WillBeHeapVector<RefPtrWillBeMember<Event> > pendingEvents;
     m_pendingEvents.swap(pendingEvents);
 
-    RefPtr<EventTarget> protect(m_owner);
+    RefPtrWillBeRawPtr<EventTarget> protect(m_owner);
     for (size_t i = 0; i < pendingEvents.size(); ++i) {
         Event* event = pendingEvents[i].get();
         EventTarget* target = event->target() ? event->target() : m_owner;