Removing using declarations that import names in the C++ Standard library.

Source/core/html/HTMLTrackElement.cpp

 /*
  * Copyright (C) 2011 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 15 matching lines @@
 #include "config.h"
 #include "core/html/HTMLTrackElement.h"
 
 #include "HTMLNames.h"
 #include "bindings/v8/ExceptionStatePlaceholder.h"
 #include "core/events/Event.h"
 #include "core/frame/csp/ContentSecurityPolicy.h"
 #include "core/html/HTMLMediaElement.h"
 #include "platform/Logging.h"
 
-using namespace std;
-
 namespace WebCore {
 
 using namespace HTMLNames;
 
 #if !LOG_DISABLED
 static String urlForLoggingTrack(const KURL& url)
 {
     static const unsigned maximumURLLengthForLogging = 128;
 
     if (url.string().length() < maximumURLLengthForLogging)
@@ skipping 223 matching lines @@
     return 0;
 }
 
 void HTMLTrackElement::trace(Visitor* visitor)
 {
     visitor->trace(m_track);
     HTMLElement::trace(visitor);
 }
 
 }