Clean up forward declarations in Source/platform

Source/platform/network/HTTPParsers.h

 /*
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2011 Apple 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
@@ skipping 19 matching lines @@
 
 #ifndef HTTPParsers_h
 #define HTTPParsers_h
 
 #include "platform/PlatformExport.h"
 #include "wtf/Forward.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
-class HTTPHeaderMap;
-class ResourceResponseBase;
-
 typedef enum {
     ContentDispositionNone,
     ContentDispositionInline,
     ContentDispositionAttachment,
     ContentDispositionOther
 } ContentDispositionType;
 
 enum ContentTypeOptionsDisposition {
     ContentTypeOptionsNone,
     ContentTypeOptionsNosniff
@@ skipping 55 matching lines @@
 
 // Parsing Complete HTTP Messages.
 enum HTTPVersion { Unknown, HTTP_1_0, HTTP_1_1 };
 PLATFORM_EXPORT size_t parseHTTPRequestLine(const char* data, size_t length, String& failureReason, String& method, String& url, HTTPVersion&);
 PLATFORM_EXPORT size_t parseHTTPHeader(const char* data, size_t length, String& failureReason, AtomicString& nameStr, AtomicString& valueStr);
 PLATFORM_EXPORT size_t parseHTTPRequestBody(const char* data, size_t length, Vector<unsigned char>& body);
 
 }
 
 #endif