[Oilpan] Fix wrong usage of HeapCountedSet<EventTarget*>

third_party/WebKit/Source/core/frame/EventHandlerRegistry.h

Index: third_party/WebKit/Source/core/frame/EventHandlerRegistry.h
diff --git a/third_party/WebKit/Source/core/frame/EventHandlerRegistry.h b/third_party/WebKit/Source/core/frame/EventHandlerRegistry.h
index b89ea927a4ad5d8ce3a45e8d2d4b52ba1ac6686d..734064d0eb44b503539644b198af006ecfbed4d6 100644
--- a/third_party/WebKit/Source/core/frame/EventHandlerRegistry.h
+++ b/third_party/WebKit/Source/core/frame/EventHandlerRegistry.h
@@ -14,7 +14,7 @@ namespace blink {
 class Document;
 class EventTarget;
 
-typedef HashCountedSet<EventTarget*> EventTargetSet;
+using EventTargetSet = WillBeHeapHashCountedSet<RawPtrWillBeMember<EventTarget>>;

[haraken, 2015/10/13 01:18:01]

I'd prefer using  WillBeHeapHashCountedSet<RawPtrWillBeWeakMember<EventTarget>>,
because the weak processing is manually done by
EventHandlerRegistry::clearWeakMembers(). (Technically it doesn't matter whether
we use Member or WeakMember because the weak processing is manually done
anyway.)

[peria, 2015/10/13 06:57:19]

Done.

 
 // Registry for keeping track of event handlers. Note that only handlers on
 // documents that can be rendered or can receive input (i.e., are attached to a