Use C++11 features in core/workers.

Source/core/workers/WorkerThread.cpp

 /*
  * Copyright (C) 2008 Apple 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 99 matching lines @@
     Closure m_closure;
     bool m_taskCanceled;
 };
 
 class WorkerSharedTimer : public SharedTimer {
 public:
     explicit WorkerSharedTimer(WorkerThread* workerThread)
         : m_workerThread(workerThread)
         , m_nextFireTime(0.0)
         , m_running(false)
-        , m_lastQueuedTask(0)
+        , m_lastQueuedTask(nullptr)
     { }
 
     typedef void (*SharedTimerFunction)();
     virtual void setFiredFunction(SharedTimerFunction func)
     {
         m_sharedTimerFunction = func;
         if (!m_sharedTimerFunction)
             m_nextFireTime = 0.0;
     }
 
@@ skipping 309 matching lines @@
     InspectorInstrumentation::didKillAllExecutionContextTasks(m_workerGlobalScope.get());
     m_debuggerMessageQueue.kill();
     postTask(WorkerThreadShutdownStartTask::create());
 }
 
 void WorkerThread::terminateAndWaitForAllWorkers()
 {
     // Keep this lock to prevent WorkerThread instances from being destroyed.
     MutexLocker lock(threadSetMutex());
     HashSet<WorkerThread*> threads = workerThreads();
-    for (HashSet<WorkerThread*>::iterator itr = threads.begin(); itr != threads.end(); ++itr)
-        (*itr)->stopInShutdownSequence();
+    for (WorkerThread* thread : threads)
+        thread->stopInShutdownSequence();
 
-    for (HashSet<WorkerThread*>::iterator itr = threads.begin(); itr != threads.end(); ++itr)
-        (*itr)->terminationEvent()->wait();
+    for (WorkerThread* thread : threads)
+        thread->terminationEvent()->wait();
 }
 
 bool WorkerThread::isCurrentThread() const
 {
     return m_thread && m_thread->isCurrentThread();
 }
 
 void WorkerThread::idleHandler()
 {
     ASSERT(m_workerGlobalScope.get());
@@ skipping 58 matching lines @@
     InspectorInstrumentation::didLeaveNestedRunLoop(m_workerGlobalScope.get());
 }
 
 void WorkerThread::setWorkerInspectorController(WorkerInspectorController* workerInspectorController)
 {
     MutexLocker locker(m_workerInspectorControllerMutex);
     m_workerInspectorController = workerInspectorController;
 }
 
 } // namespace blink