Clean up forward declarations in Source/platform

Source/platform/network/FormData.h

 /*
  * Copyright (C) 2004, 2006, 2008, 2011 Apple Inc. All rights reserved.
  *
  * 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.
  */
 
 #ifndef FormData_h
 #define FormData_h
 
 #include "platform/blob/BlobData.h"
 #include "platform/weborigin/KURL.h"
 #include "wtf/Forward.h"
 #include "wtf/RefCounted.h"
 #include "wtf/Vector.h"
 #include "wtf/text/WTFString.h"
 
-namespace WTF{
-class TextEncoding;
-}
-
 namespace blink {
 
 class BlobDataHandle;
 
 class PLATFORM_EXPORT FormDataElement {
 public:
     FormDataElement() : m_type(data) { }
     explicit FormDataElement(const Vector<char>& array) : m_type(data), m_data(array) { }
 
     FormDataElement(const String& filename, long long fileStart, long long fileLength, double expectedFileModificationTime) : m_type(encodedFile), m_filename(filename), m_fileStart(fileStart), m_fileLength(fileLength), m_expectedFileModificationTime(expectedFileModificationTime) { }
@@ skipping 113 matching lines @@
 }
 
 inline bool operator!=(const FormData& a, const FormData& b)
 {
     return !(a == b);
 }
 
 } // namespace blink
 
 #endif