Add Accept-CH meta http-equiv support to the preloader.

Source/core/html/parser/PreloadRequest.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/html/parser/PreloadRequest.h"
 
 #include "core/dom/Document.h"
 #include "core/fetch/FetchInitiatorInfo.h"
 
@@ skipping 18 matching lines @@
     FetchInitiatorInfo initiatorInfo;
     initiatorInfo.name = AtomicString(m_initiatorName);
     initiatorInfo.position = m_initiatorPosition;
     FetchRequest request(ResourceRequest(completeURL(document)), initiatorInfo);
 
     if (m_isCORSEnabled)
         request.setCrossOriginAccessControl(document->securityOrigin(), m_allowCredentials);
 
     request.setDefer(m_defer);
     request.setResourceWidth(m_resourceWidth);
+    request.setClientHintsPreferences(m_clientHintsPreferences);
 
     return request;
 }
 
 }