Make ClientHintsPreferences class work like a class.

Source/core/loader/FrameFetchContext.cpp

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 216 matching lines @@
 }
 
 void FrameFetchContext::dispatchDidReceiveResponse(unsigned long identifier, const ResourceResponse& response, ResourceLoader* resourceLoader)
 {
     MixedContentChecker::checkMixedPrivatePublic(frame(), response.remoteIPAddress());
     LinkLoader::loadLinkFromHeader(response.httpHeaderField("Link"), frame()->document(), NetworkHintsInterfaceImpl());
     if (m_documentLoader == frame()->loader().provisionalDocumentLoader()) {
         ResourceFetcher* fetcher = nullptr;
         if (frame()->document())
             fetcher = frame()->document()->fetcher();
-        handleAcceptClientHintsHeader(response.httpHeaderField("accept-ch"), m_documentLoader->clientHintsPreferences(), fetcher);
+        m_documentLoader->clientHintsPreferences().updateFromAcceptClientHintsHeader(response.httpHeaderField("accept-ch"), fetcher);
     }
 
     frame()->loader().progress().incrementProgress(identifier, response);
     frame()->loader().client()->dispatchDidReceiveResponse(m_documentLoader, identifier, response);
     TRACE_EVENT_INSTANT1("devtools.timeline", "ResourceReceiveResponse", TRACE_EVENT_SCOPE_THREAD, "data", InspectorReceiveResponseEvent::data(identifier, frame(), response));
     DocumentLoader* documentLoader = ensureLoaderForNotifications();
     InspectorInstrumentation::didReceiveResourceResponse(frame(), identifier, documentLoader, response, resourceLoader);
     // It is essential that inspector gets resource response BEFORE console.
     frame()->console().reportResourceResponseReceived(documentLoader, identifier, response);
 }
@@ skipping 449 matching lines @@
 
 
 DEFINE_TRACE(FrameFetchContext)
 {
     visitor->trace(m_document);
     visitor->trace(m_documentLoader);
     FetchContext::trace(visitor);
 }
 
 } // namespace blink