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

Source/core/events/Event.h

Index: Source/core/events/Event.h
diff --git a/Source/core/events/Event.h b/Source/core/events/Event.h
index 3a2fb15f4ee47a48f7fa42b09d2d06266091b2ca..76edb46745fda0b34e6c4151de82c578f54d3303 100644
--- a/Source/core/events/Event.h
+++ b/Source/core/events/Event.h
@@ -112,7 +112,7 @@ public:
     void setType(const AtomicString& type) { m_type = type; }
 
     EventTarget* target() const { return m_target.get(); }
-    void setTarget(PassRefPtr<EventTarget>);
+    void setTarget(PassRefPtrWillBeRawPtr<EventTarget>);
 
     EventTarget* currentTarget() const { return m_currentTarget; }
     void setCurrentTarget(EventTarget* currentTarget) { m_currentTarget = currentTarget; }