Revert of Add task location information to ExecutionContext

Source/core/workers/WorkerEventQueue.cpp

 /*
  * Copyright (C) 2010 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 101 matching lines @@
 }
 
 bool WorkerEventQueue::enqueueEvent(PassRefPtrWillBeRawPtr<Event> prpEvent)
 {
     if (m_isClosed)
         return false;
     RefPtrWillBeRawPtr<Event> event = prpEvent;
     InspectorInstrumentation::didEnqueueEvent(event->target(), event.get());
     OwnPtr<EventDispatcherTask> task = EventDispatcherTask::create(event, this);
     m_eventTaskMap.add(event.release(), task.get());
-    m_executionContext->postTask(FROM_HERE, task.release());
+    m_executionContext->postTask(task.release());
     return true;
 }
 
 bool WorkerEventQueue::cancelEvent(Event* event)
 {
     EventDispatcherTask* task = m_eventTaskMap.get(event);
     if (!task)
         return false;
     task->cancel();
     removeEvent(event);
     return true;
 }
 
 void WorkerEventQueue::close()
 {
     m_isClosed = true;
     for (const auto& entry : m_eventTaskMap) {
         Event* event = entry.key.get();
         EventDispatcherTask* task = entry.value;
         InspectorInstrumentation::didRemoveEvent(event->target(), event);
         task->cancel();
     }
     m_eventTaskMap.clear();
 }
 
 }