Remove unused "using" statements in WebKit/Source/platform.

third_party/WebKit/Source/platform/Length.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) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 10 matching lines @@
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #include "platform/Length.h"
 
 #include "platform/CalculationValue.h"
 #include "platform/animation/AnimationUtilities.h"
 
-using namespace WTF;
-
 namespace blink {
 
 class CalculationValueHandleMap {
   USING_FAST_MALLOC(CalculationValueHandleMap);
   WTF_MAKE_NONCOPYABLE(CalculationValueHandleMap);
 
  public:
   CalculationValueHandleMap() : index_(1) {}
 
   int insert(PassRefPtr<CalculationValue> calc_value) {
@@ skipping 132 matching lines @@
 }
 
 struct SameSizeAsLength {
   int32_t value;
   int32_t meta_data;
 };
 static_assert(sizeof(Length) == sizeof(SameSizeAsLength),
               "length should stay small");
 
 }  // namespace blink