[WIP] Migrate hasPendingActivity from ActiveDOMObject to ScriptWrappable.

third_party/WebKit/Source/core/dom/ScriptedIdleTaskController.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ScriptedIdleTaskController_h
 #define ScriptedIdleTaskController_h
 
 #include "core/dom/ActiveDOMObject.h"
 #include "core/dom/IdleDeadline.h"
 #include "platform/Timer.h"
@@ skipping 21 matching lines @@
 
     using CallbackId = int;
 
     int registerCallback(IdleRequestCallback*, const IdleRequestOptions&);
     void cancelCallback(CallbackId);
 
     // ActiveDOMObject interface.
     void stop() override;
     void suspend() override;
     void resume() override;
-    bool hasPendingActivity() const override;
+    bool hasPendingActivity() const;
 
     void callbackFired(CallbackId, double deadlineSeconds, IdleDeadline::CallbackType);
 
 private:
     explicit ScriptedIdleTaskController(ExecutionContext*);
 
     void runCallback(CallbackId, double deadlineSeconds, IdleDeadline::CallbackType);
 
     WebScheduler* m_scheduler; // Not owned.
     PersistentHeapHashMapWillBeHeapHashMap<CallbackId, Member<IdleRequestCallback>> m_callbacks;
     Vector<CallbackId> m_pendingTimeouts;
     CallbackId m_nextCallbackId;
     bool m_suspended;
 };
 
 } // namespace blink
 
 #endif // ScriptedIdleTaskController_h