Move fetch-related predicates to core/fetch.

Source/core/xml/XMLHttpRequest.h

 /*
  *  Copyright (C) 2003, 2006, 2008 Apple Inc. All rights reserved.
  *  Copyright (C) 2005, 2006 Alexey Proskuryakov <ap@nypop.com>
  *  Copyright (C) 2011 Google Inc. All rights reserved.
  *  Copyright (C) 2012 Intel Corporation
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public
  *  License as published by the Free Software Foundation; either
  *  version 2 of the License, or (at your option) any later version.
@@ skipping 106 matching lines @@
     ScriptString responseJSONSource();
     Document* responseXML(ExceptionState&);
     Blob* responseBlob();
     Stream* responseStream();
     unsigned long timeout() const { return m_timeoutMilliseconds; }
     void setTimeout(unsigned long timeout, ExceptionState&);
 
     void sendForInspectorXHRReplay(PassRefPtr<FormData>, ExceptionState&);
 
     // Expose HTTP validation methods for other untrusted requests.
-    static bool isAllowedHTTPMethod(const String&);
     static AtomicString uppercaseKnownHTTPMethod(const AtomicString&);
-    static bool isAllowedHTTPHeader(const String&);
 
     void setResponseType(const String&, ExceptionState&);
     String responseType();
     ResponseTypeCode responseTypeCode() const { return m_responseTypeCode; }
 
     String responseURL();
 
     // response attribute has custom getter.
     ArrayBuffer* responseArrayBuffer();
 
@@ skipping 117 matching lines @@
     bool m_createdDocument;
     bool m_error;
     bool m_uploadEventsAllowed;
     bool m_uploadComplete;
     bool m_sameOriginRequest;
 };
 
 } // namespace blink
 
 #endif // XMLHttpRequest_h