Ensure CSS scanner does not mark preloads as referenced

third_party/WebKit/Source/core/html/parser/CSSPreloadScanner.cpp

 /*
  * Copyright (C) 2008, 2010 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 239 matching lines @@
 }
 
 CSSPreloaderResourceClient::CSSPreloaderResourceClient(
     Resource* resource,
     HTMLResourcePreloader* preloader)
     : m_policy(preloader->document()->settings()->cssExternalScannerPreload()
                    ? ScanAndPreload
                    : ScanOnly),
       m_preloader(preloader),
       m_resource(toCSSStyleSheetResource(resource)) {
-  m_resource->addClient(this);
+  m_resource->addClient(this, Resource::DontMarkAsReferenced);
 }
 
 CSSPreloaderResourceClient::~CSSPreloaderResourceClient() {}
 
 void CSSPreloaderResourceClient::setCSSStyleSheet(
     const String& href,
     const KURL& baseURL,
     const String& charset,
     const CSSStyleSheetResource*) {
   clearResource();
@@ skipping 54 matching lines @@
   m_resource.clear();
 }
 
 DEFINE_TRACE(CSSPreloaderResourceClient) {
   visitor->trace(m_preloader);
   visitor->trace(m_resource);
   StyleSheetResourceClient::trace(visitor);
 }
 
 }  // namespace blink