Oilpan: move core/fileapi to oilpan's heap.

Source/core/events/MessageEvent.cpp

Index: Source/core/events/MessageEvent.cpp
diff --git a/Source/core/events/MessageEvent.cpp b/Source/core/events/MessageEvent.cpp
index b081d3112ad4770c88e17c6feeb5d305642bfe35..7c9fa6251ff63a0d812a169edc6f5f2662372228 100644
--- a/Source/core/events/MessageEvent.cpp
+++ b/Source/core/events/MessageEvent.cpp
@@ -112,7 +112,7 @@ MessageEvent::MessageEvent(const String& data, const String& origin)
     ScriptWrappable::init(this);
 }
 
-MessageEvent::MessageEvent(PassRefPtr<Blob> data, const String& origin)
+MessageEvent::MessageEvent(PassRefPtrWillBeRawPtr<Blob> data, const String& origin)
     : Event(EventTypeNames::message, false, false)
     , m_dataType(DataTypeBlob)
     , m_dataAsBlob(data)
@@ -187,6 +187,7 @@ void MessageEvent::entangleMessagePorts(ExecutionContext* context)
 
 void MessageEvent::trace(Visitor* visitor)
 {
+    visitor->trace(m_dataAsBlob);

[sof, 2014/03/01 14:44:06]

When rebasing this CL to have it cleanly apply with current trunk, the changes
here met with the support for heap-allocated Events.

Hence, MessageEvent has now switched its Blob reference to be a Member rather
than a Persistent. Please double check.

     Event::trace(visitor);
 }