Make ClientHintsPreferences class work like a class.

Source/core/html/parser/HTMLPreloadScanner.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2009 Torch Mobile, Inc. http://www.torchmobile.com/
  * Copyright (C) 2010 Google 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
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 557 matching lines @@
         }
         if (match(tagImpl, metaTag)) {
             const typename Token::Attribute* equivAttribute = token.getAttributeItem(http_equivAttr);
             if (equivAttribute) {
                 String equivAttributeValue(equivAttribute->value);
                 if (equalIgnoringCase(equivAttributeValue, "content-security-policy")) {
                     m_isCSPEnabled = true;
                 } else if (equalIgnoringCase(equivAttributeValue, "accept-ch")) {
                     const typename Token::Attribute* contentAttribute = token.getAttributeItem(contentAttr);
                     if (contentAttribute)
-                        handleAcceptClientHintsHeader(String(contentAttribute->value), m_clientHintsPreferences, nullptr);
+                        m_clientHintsPreferences.updateFromAcceptClientHintsHeader(String(contentAttribute->value), nullptr);
                 }
                 return;
             }
 
             handleMetaNameAttribute(token, m_documentParameters.get(), &m_cssScanner);
         }
 
         if (match(tagImpl, pictureTag)) {
             m_inPicture = true;
             m_pictureData = PictureData();
@@ skipping 72 matching lines @@
     else
         mediaValues = MediaValuesCached::create(*document);
     ASSERT(mediaValues->isSafeToSendToAnotherThread());
     defaultViewportMinWidth = document->viewportDefaultMinWidth();
     viewportMetaZeroValuesQuirk = document->settings() && document->settings()->viewportMetaZeroValuesQuirk();
     viewportMetaEnabled = document->settings() && document->settings()->viewportMetaEnabled();
     referrerPolicy = ReferrerPolicyDefault;
 }
 
 }