Revert of Revert of Oilpan: Prepare to make ExecutionContext GarbageCollectedMixin.

Source/core/dom/MainThreadTaskRunnerTest.cpp

Index: Source/core/dom/MainThreadTaskRunnerTest.cpp
diff --git a/Source/core/dom/MainThreadTaskRunnerTest.cpp b/Source/core/dom/MainThreadTaskRunnerTest.cpp
index 67a445decf01b048ff8959f7911084ba1c05f7b1..af3355d8adcde752790b0a749a8b7a637d3448bf 100644
--- a/Source/core/dom/MainThreadTaskRunnerTest.cpp
+++ b/Source/core/dom/MainThreadTaskRunnerTest.cpp
@@ -47,13 +47,17 @@
     virtual void close() OVERRIDE { }
 };
 
-class NullExecutionContext : public ExecutionContext, public RefCounted<NullExecutionContext> {
+class NullExecutionContext : public RefCountedWillBeGarbageCollectedFinalized<NullExecutionContext>, public ExecutionContext {
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(NullExecutionContext);
 public:
+    void trace(Visitor* visitor) { ExecutionContext::trace(visitor); }
+#if !ENABLE(OILPAN)
     using RefCounted<NullExecutionContext>::ref;
     using RefCounted<NullExecutionContext>::deref;
 
     virtual void refExecutionContext() OVERRIDE { ref(); }
     virtual void derefExecutionContext() OVERRIDE { deref(); }
+#endif
     virtual EventQueue* eventQueue() const OVERRIDE { return m_queue.get(); }
     virtual bool tasksNeedSuspension() { return m_tasksNeedSuspension; }
 
@@ -95,7 +99,7 @@
 
 TEST(MainThreadTaskRunnerTest, PostTask)
 {
-    RefPtr<NullExecutionContext> context = adoptRef(new NullExecutionContext());
+    RefPtrWillBeRawPtr<NullExecutionContext> context = adoptRefWillBeNoop(new NullExecutionContext());
     OwnPtr<MainThreadTaskRunner> runner = MainThreadTaskRunner::create(context.get());
     bool isMarked = false;
 
@@ -107,7 +111,7 @@
 
 TEST(MainThreadTaskRunnerTest, SuspendTask)
 {
-    RefPtr<NullExecutionContext> context = adoptRef(new NullExecutionContext());
+    RefPtrWillBeRawPtr<NullExecutionContext> context = adoptRefWillBeNoop(new NullExecutionContext());
     OwnPtr<MainThreadTaskRunner> runner = MainThreadTaskRunner::create(context.get());
     bool isMarked = false;
 
@@ -125,7 +129,7 @@
 
 TEST(MainThreadTaskRunnerTest, RemoveRunner)
 {
-    RefPtr<NullExecutionContext> context = adoptRef(new NullExecutionContext());
+    RefPtrWillBeRawPtr<NullExecutionContext> context = adoptRefWillBeNoop(new NullExecutionContext());
     OwnPtr<MainThreadTaskRunner> runner = MainThreadTaskRunner::create(context.get());
     bool isMarked = false;