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

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

Index: third_party/WebKit/Source/core/html/parser/CSSPreloadScanner.h
diff --git a/third_party/WebKit/Source/core/html/parser/CSSPreloadScanner.h b/third_party/WebKit/Source/core/html/parser/CSSPreloadScanner.h
index f53cf262eaf78769ec4a8746577bac08e165fd84..152f3e9a483ade35ebda7b6dc68be459d70b4d4a 100644
--- a/third_party/WebKit/Source/core/html/parser/CSSPreloadScanner.h
+++ b/third_party/WebKit/Source/core/html/parser/CSSPreloadScanner.h
@@ -107,6 +107,12 @@ protected:
 private:
     void scanCSS(const CSSStyleSheetResource*);
 
+    enum PreloadPolicy {
+        ScanOnly,
+        ScanAndPreload,
+    };
+
+    const PreloadPolicy m_policy;
     WeakMember<HTMLResourcePreloader> m_preloader;
 };