Oilpan: Remove raw pointer to ExecutionContext from WorkerInspectorProxy

Source/core/inspector/InspectorWorkerAgent.h

Index: Source/core/inspector/InspectorWorkerAgent.h
diff --git a/Source/core/inspector/InspectorWorkerAgent.h b/Source/core/inspector/InspectorWorkerAgent.h
index 52e61155a949a971919bec445c2b8e54a922466d..d1285cf1e643c4fd169360bf47fbfda3745dc19d 100644
--- a/Source/core/inspector/InspectorWorkerAgent.h
+++ b/Source/core/inspector/InspectorWorkerAgent.h
@@ -48,6 +48,7 @@ class CORE_EXPORT InspectorWorkerAgent final : public InspectorBaseAgent<Inspect
 public:
     static PassOwnPtrWillBeRawPtr<InspectorWorkerAgent> create(PageConsoleAgent*);
     ~InspectorWorkerAgent() override;
+    DECLARE_TRACE();
 
     void init() override;
     void disable(ErrorString*) override;
@@ -81,7 +82,7 @@ private:
         String id;
     };
     class WorkerAgentClient;
-    typedef HashMap<String, WorkerAgentClient*> WorkerClients;
+    typedef WillBeHeapHashMap<String, OwnPtrWillBeMember<WorkerAgentClient>> WorkerClients;
     WorkerClients m_idToClient;
     typedef HashMap<WorkerInspectorProxy*, WorkerInfo> WorkerInfos;
     WorkerInfos m_workerInfos;