Oilpan: convert remaining OwnPtr EventQueue uses.

Source/modules/indexeddb/IDBRequestTest.cpp

Index: Source/modules/indexeddb/IDBRequestTest.cpp
diff --git a/Source/modules/indexeddb/IDBRequestTest.cpp b/Source/modules/indexeddb/IDBRequestTest.cpp
index d346d6c054fb79716aa3585e6731ca232b81fec3..a05fa05eee8047609a04224d52fb44a3472d1281 100644
--- a/Source/modules/indexeddb/IDBRequestTest.cpp
+++ b/Source/modules/indexeddb/IDBRequestTest.cpp
@@ -56,7 +56,16 @@ public:
 class NullExecutionContext FINAL : public RefCountedWillBeGarbageCollectedFinalized<NullExecutionContext>, public ExecutionContext {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(NullExecutionContext);
 public:
-    void trace(Visitor* visitor) { ExecutionContext::trace(visitor); }
+    NullExecutionContext();
+
+    virtual EventQueue* eventQueue() const OVERRIDE { return m_queue.get(); }
+
+    void trace(Visitor* visitor)
+    {
+        visitor->trace(m_queue);
+        ExecutionContext::trace(visitor);
+    }
+
 #if !ENABLE(OILPAN)
     using RefCounted<NullExecutionContext>::ref;
     using RefCounted<NullExecutionContext>::deref;
@@ -64,15 +73,13 @@ public:
     virtual void refExecutionContext() OVERRIDE { ref(); }
     virtual void derefExecutionContext() OVERRIDE { deref(); }
 #endif
-    virtual EventQueue* eventQueue() const OVERRIDE { return m_queue.get(); }
 
-    NullExecutionContext();
 private:
-    OwnPtr<EventQueue> m_queue;
+    OwnPtrWillBeMember<EventQueue> m_queue;
 };
 
 NullExecutionContext::NullExecutionContext()
-    : m_queue(adoptPtr(new NullEventQueue()))
+    : m_queue(adoptPtrWillBeNoop(new NullEventQueue()))
 {
 }