Remove duplicated headers from platform/

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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #include "config.h"
 #include "platform/Length.h"
 
 #include "platform/CalculationValue.h"
 #include "wtf/ASCIICType.h"
-#include "wtf/Assertions.h"
 #include "wtf/text/StringBuffer.h"
 #include "wtf/text/WTFString.h"
 
 using namespace WTF;
 
 namespace WebCore {
 
 template<typename CharType>
 static unsigned splitLength(const CharType* data, unsigned length, unsigned& intLength, unsigned& doubleLength)
 {
@@ skipping 172 matching lines @@
     return isCalculated() && (calculationValue() == o.calculationValue() || *calculationValue() == *o.calculationValue());
 }
 
 struct SameSizeAsLength {
     int32_t value;
     int32_t metaData;
 };
 COMPILE_ASSERT(sizeof(Length) == sizeof(SameSizeAsLength), length_should_stay_small);
 
 } // namespace WebCore