Refactor the forPreload flag to mean speculative preload.

third_party/WebKit/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 "core/html/parser/PreloadRequest.h"
 
 #include "core/dom/Document.h"
 #include "core/loader/DocumentLoader.h"
 #include "platform/CrossOriginAttributeValue.h"
 #include "platform/loader/fetch/FetchInitiatorInfo.h"
@@ skipping 56 matching lines @@
 
   if (m_requestType == RequestTypeLinkRelPreload)
     request.setLinkPreload(true);
 
   if (m_resourceType == Resource::Script ||
       m_resourceType == Resource::CSSStyleSheet ||
       m_resourceType == Resource::ImportResource) {
     request.setCharset(
         m_charset.isEmpty() ? document->characterSet().getString() : m_charset);
   }
-  request.setForPreload(true, m_discoveryTime);
+  request.setSpeculativePreload(true, m_discoveryTime);
 
   return document->loader()->startPreload(m_resourceType, request);
 }
 
 }  // namespace blink