[@import scanner] Don't access Document::settings() from appendData callback

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

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 89 matching lines @@
     DECLARE_TRACE();
 
 protected:
     // Protected for tests, which don't want to initialize a fully featured
     // DocumentLoader.
     virtual void fetchPreloads(PreloadRequestStream& preloads);
 
 private:
     void scanCSS(const CSSStyleSheetResource*);
 
+    enum PreloadPolicy {
+        ScanOnly,
+        ScanAndPreload,
+    };
+
+    const PreloadPolicy m_policy;
     WeakMember<HTMLResourcePreloader> m_preloader;
 };
 
 } // namespace blink
 
 #endif