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

Source/core/events/FocusEvent.h

Index: Source/core/events/FocusEvent.h
diff --git a/Source/core/events/FocusEvent.h b/Source/core/events/FocusEvent.h
index 8e390a15b1e002661cf9afa0f35fe6fee895bfb5..e5d4115ed2030ae5a5469a243d4c3b2bfbd0e44b 100644
--- a/Source/core/events/FocusEvent.h
+++ b/Source/core/events/FocusEvent.h
@@ -36,7 +36,7 @@ class Node;
 struct FocusEventInit : public UIEventInit {
     FocusEventInit();
 
-    RefPtr<EventTarget> relatedTarget;
+    RefPtrWillBeMember<EventTarget> relatedTarget;
 };
 
 class FocusEvent FINAL : public UIEvent {
@@ -70,7 +70,7 @@ private:
     FocusEvent(const AtomicString& type, bool canBubble, bool cancelable, PassRefPtrWillBeRawPtr<AbstractView>, int, EventTarget*);
     FocusEvent(const AtomicString& type, const FocusEventInit&);
 
-    RefPtr<EventTarget> m_relatedTarget;
+    RefPtrWillBeMember<EventTarget> m_relatedTarget;
 };
 
 DEFINE_EVENT_TYPE_CASTS(FocusEvent);