Oilpan: move WorkerGlobalScope to oilpan's heap.

Source/core/workers/WorkerGlobalScope.h

Index: Source/core/workers/WorkerGlobalScope.h
diff --git a/Source/core/workers/WorkerGlobalScope.h b/Source/core/workers/WorkerGlobalScope.h
index 3648d24ca677ec7a9e6cfffefb88aee541d16ffb..81c6bd5a65e4464fed8fcb4bb656c75b2fe97d04 100644
--- a/Source/core/workers/WorkerGlobalScope.h
+++ b/Source/core/workers/WorkerGlobalScope.h
@@ -57,8 +57,8 @@ namespace WebCore {
     class WorkerNavigator;
     class WorkerThread;
 
-    class WorkerGlobalScope : public RefCounted<WorkerGlobalScope>, public ScriptWrappable, public SecurityContext, public ExecutionContext, public ExecutionContextClient, public WorkerSupplementable, public EventTargetWithInlineData {
-        REFCOUNTED_EVENT_TARGET(WorkerGlobalScope);
+    class WorkerGlobalScope : public RefCountedWillBeRefCountedGarbageCollected<WorkerGlobalScope>, public ScriptWrappable, public SecurityContext, public ExecutionContext, public ExecutionContextClient, public WorkerSupplementable, public EventTargetWithInlineData {
+        DEFINE_EVENT_TARGET_REFCOUNTING(RefCountedWillBeRefCountedGarbageCollected<WorkerGlobalScope>);
     public:
         virtual ~WorkerGlobalScope();
 
@@ -80,7 +80,10 @@ namespace WebCore {
         void clearScript() { m_script.clear(); }
         void clearInspector();
 
+        void detach();
+
         WorkerThread* thread() const { return m_thread; }
+        void clearThread() { m_thread = 0; }
 
         virtual void postTask(PassOwnPtr<ExecutionContextTask>) OVERRIDE FINAL; // Executes the task on context's thread asynchronously.
 
@@ -123,6 +126,8 @@ namespace WebCore {
         using SecurityContext::securityOrigin;
         using SecurityContext::contentSecurityPolicy;
 
+        virtual void trace(Visitor*);
+
     protected:
         WorkerGlobalScope(const KURL&, const String& userAgent, WorkerThread*, double timeOrigin, PassOwnPtr<WorkerClients>);
         void applyContentSecurityPolicyFromString(const String& contentSecurityPolicy, ContentSecurityPolicy::HeaderType);
@@ -146,9 +151,9 @@ namespace WebCore {
         KURL m_url;
         String m_userAgent;
 
-        mutable RefPtr<WorkerConsole> m_console;
-        mutable RefPtr<WorkerLocation> m_location;
-        mutable RefPtr<WorkerNavigator> m_navigator;
+        mutable RefPtrWillBeMember<WorkerConsole> m_console;
+        mutable RefPtrWillBeMember<WorkerLocation> m_location;
+        mutable RefPtrWillBeMember<WorkerNavigator> m_navigator;
 
         OwnPtr<WorkerScriptController> m_script;
         WorkerThread* m_thread;
@@ -156,8 +161,6 @@ namespace WebCore {
         OwnPtr<WorkerInspectorController> m_workerInspectorController;
         bool m_closing;
 
-        HashSet<Observer*> m_workerObservers;
-
         OwnPtr<WorkerEventQueue> m_eventQueue;
 
         OwnPtr<WorkerClients> m_workerClients;