Remove ActiveDOMObject::willStop, and introduce WorkerGlobalScope::TerminationObserver.

Source/core/dom/ContextLifecycleNotifier.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2013 Google Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 68 matching lines @@
 {
     TemporaryChange<IterationType> scope(this->m_iterating, IteratingOverActiveDOMObjects);
     ActiveDOMObjectSet::iterator activeObjectsEnd = m_activeDOMObjects.end();
     for (ActiveDOMObjectSet::iterator iter = m_activeDOMObjects.begin(); iter != activeObjectsEnd; ++iter) {
         ASSERT((*iter)->executionContext() == context());
         ASSERT((*iter)->suspendIfNeededCalled());
         (*iter)->suspend();
     }
 }
 
-void ContextLifecycleNotifier::notifyWillStopActiveDOMObjects()
-{
-    TemporaryChange<IterationType> scope(this->m_iterating, IteratingOverActiveDOMObjects);
-    ActiveDOMObjectSet::iterator activeObjectsEnd = m_activeDOMObjects.end();
-    for (ActiveDOMObjectSet::iterator iter = m_activeDOMObjects.begin(); iter != activeObjectsEnd; ++iter) {
-        ASSERT((*iter)->executionContext() == context());
-        ASSERT((*iter)->suspendIfNeededCalled());
-        (*iter)->willStop();
-    }
-}
-
 void ContextLifecycleNotifier::notifyStoppingActiveDOMObjects()
 {
     TemporaryChange<IterationType> scope(this->m_iterating, IteratingOverActiveDOMObjects);
     ActiveDOMObjectSet::iterator activeObjectsEnd = m_activeDOMObjects.end();
     for (ActiveDOMObjectSet::iterator iter = m_activeDOMObjects.begin(); iter != activeObjectsEnd; ++iter) {
         ASSERT((*iter)->executionContext() == context());
         ASSERT((*iter)->suspendIfNeededCalled());
         (*iter)->stop();
     }
 }
 
 bool ContextLifecycleNotifier::hasPendingActivity() const
 {
     ActiveDOMObjectSet::const_iterator activeObjectsEnd = activeDOMObjects().end();
     for (ActiveDOMObjectSet::const_iterator iter = activeDOMObjects().begin(); iter != activeObjectsEnd; ++iter) {
         if ((*iter)->hasPendingActivity())
             return true;
     }
 
     return false;
 }
 
 } // namespace WebCore