Revert r189385 "Remove LifecycleContext" and r189391, r189530, r189456 that block it

Source/modules/serviceworkers/WaitUntilObserver.h

 // Copyright 2014 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 WaitUntilObserver_h
 #define WaitUntilObserver_h
 
 #include "core/dom/ContextLifecycleObserver.h"
 #include "modules/serviceworkers/ServiceWorkerGlobalScopeClient.h"
-#include "platform/Timer.h"
 #include "wtf/Forward.h"
 #include "wtf/RefCounted.h"
 
 namespace blink {
 
 class ExceptionState;
 class ExecutionContext;
 class ScriptState;
 class ScriptValue;
 
@@ skipping 23 matching lines @@
 private:
     class ThenFunction;
 
     WaitUntilObserver(ExecutionContext*, EventType, int eventID);
 
     void reportError(const ScriptValue&);
 
     void incrementPendingActivity();
     void decrementPendingActivity();
 
-    void consumeWindowInteraction(Timer<WaitUntilObserver>*);
-
     EventType m_type;
     int m_eventID;
     int m_pendingActivity;
     bool m_hasError;
     bool m_eventDispatched;
-    Timer<WaitUntilObserver> m_consumeWindowInteractionTimer;
 };
 
 } // namespace blink
 
 #endif // WaitUntilObserver_h