Removing unnecessary "using" statements.

third_party/WebKit/Source/core/events/EventTarget.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>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ skipping 37 matching lines @@
 #include "core/frame/Settings.h"
 #include "core/frame/UseCounter.h"
 #include "core/probe/CoreProbes.h"
 #include "platform/EventDispatchForbiddenScope.h"
 #include "platform/Histogram.h"
 #include "wtf/PtrUtil.h"
 #include "wtf/StdLibExtras.h"
 #include "wtf/Threading.h"
 #include "wtf/Vector.h"
 
-using namespace WTF;
-
 namespace blink {
 namespace {
 
 enum PassiveForcedListenerResultType {
   PreventDefaultNotCalled,
   DocumentLevelTouchPreventDefaultCalled,
   PassiveForcedListenerResultTypeMax
 };
 
 Event::PassiveMode eventPassiveMode(
@@ skipping 701 matching lines @@
   // they have one less listener to invoke.
   if (d->firingEventIterators) {
     for (const auto& iterator : *d->firingEventIterators) {
       iterator.iterator = 0;
       iterator.end = 0;
     }
   }
 }
 
 }  // namespace blink