Oilpan: fix build after r187699.

Source/core/inspector/AsyncCallStackTracker.h

Index: Source/core/inspector/AsyncCallStackTracker.h
diff --git a/Source/core/inspector/AsyncCallStackTracker.h b/Source/core/inspector/AsyncCallStackTracker.h
index 75c9ec6a2cdebbd5ded7aba92084d779a7d19721..d5a0226fa616a3ca6e4379f427a83d981e8668ff 100644
--- a/Source/core/inspector/AsyncCallStackTracker.h
+++ b/Source/core/inspector/AsyncCallStackTracker.h
@@ -53,11 +53,12 @@ class MutationObserver;
 class ThreadableLoaderClient;
 class XMLHttpRequest;
 
-class AsyncCallStackTracker final : public NoBaseWillBeGarbageCollected<AsyncCallStackTracker>, public InspectorDebuggerAgent::AsyncCallTrackingListener {
+class AsyncCallStackTracker final : public NoBaseWillBeGarbageCollectedFinalized<AsyncCallStackTracker>, public InspectorDebuggerAgent::AsyncCallTrackingListener {
     WTF_MAKE_NONCOPYABLE(AsyncCallStackTracker);
-    DECLARE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(AsyncCallStackTracker);
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(AsyncCallStackTracker);
 public:
     AsyncCallStackTracker(InspectorDebuggerAgent*, InstrumentingAgents*);
+    virtual ~AsyncCallStackTracker();
 
     // InspectorDebuggerAgent::AsyncCallTrackingListener implementation:
     void asyncCallTrackingStateChanged(bool tracking) override;
@@ -111,7 +112,7 @@ private:
 
     using ExecutionContextDataMap = WillBeHeapHashMap<RawPtrWillBeMember<ExecutionContext>, OwnPtrWillBeMember<ExecutionContextData>>;
     ExecutionContextDataMap m_executionContextDataMap;
-    InspectorDebuggerAgent* m_debuggerAgent;
+    RawPtrWillBeMember<InspectorDebuggerAgent> m_debuggerAgent;
     RawPtrWillBeMember<InstrumentingAgents> m_instrumentingAgents;
 };