Removing unnecessary "using" statements.

third_party/WebKit/Source/core/events/EventListenerMap.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  *           (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2011 Andreas Kling (kling@webkit.org)
  *
  * Redistribution and use in source and binary forms, with or without
@@ skipping 23 matching lines @@
 
 #include "core/events/EventTarget.h"
 #include "wtf/StdLibExtras.h"
 #include "wtf/Vector.h"
 
 #if DCHECK_IS_ON()
 #include "wtf/Threading.h"
 #include "wtf/ThreadingPrimitives.h"
 #endif
 
-using namespace WTF;
-
 namespace blink {
 
 #if DCHECK_IS_ON()
 static Mutex& activeIteratorCountMutex() {
   DEFINE_THREAD_SAFE_STATIC_LOCAL(Mutex, mutex, new Mutex());
   return mutex;
 }
 
 void EventListenerMap::checkNoActiveIterators() {
   MutexLocker locker(activeIteratorCountMutex());
@@ skipping 190 matching lines @@
     EventListenerVector& listeners = *m_map->m_entries[m_entryIndex].second;
     if (m_index < listeners.size())
       return listeners[m_index++].listener();
     m_index = 0;
   }
 
   return nullptr;
 }
 
 }  // namespace blink