Fix setting properties on CSSFontFaceRule

third_party/WebKit/Source/core/css/parser/CSSParserMode.h

 /*
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  * Copyright (C) 2012 Apple 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
@@ skipping 30 matching lines @@
 class Document;
 
 // Must not grow beyond 3 bits, due to packing in StylePropertySet.
 enum CSSParserMode {
   HTMLStandardMode,
   HTMLQuirksMode,
   // HTML attributes are parsed in quirks mode but also allows internal properties and values.
   HTMLAttributeMode,
   // SVG attributes are parsed in quirks mode but rules differ slightly.
   SVGAttributeMode,
-  // @viewport rules are parsed in standards mode but CSSOM modifications (via StylePropertySet)
-  // must call parseViewportProperties so needs a special mode.
+  // @viewport/@font-face rules are specially tagged in StylePropertySet so CSSOM modifications don't treat them as style rules.
   CSSViewportRuleMode,
+  CSSFontFaceRuleMode,
   // User agent stylesheets are parsed in standards mode but also allows internal properties and values.
   UASheetMode
 };
 
 inline bool isQuirksModeBehavior(CSSParserMode mode) {
   return mode == HTMLQuirksMode;  // || mode == HTMLAttributeMode;
 }
 
 inline bool isUASheetBehavior(CSSParserMode mode) {
   return mode == UASheetMode;
@@ skipping 76 matching lines @@
   ContentSecurityPolicyDisposition m_shouldCheckContentSecurityPolicy;
 
   UseCounter* m_useCounter;
 };
 
 CORE_EXPORT const CSSParserContext& strictCSSParserContext();
 
 }  // namespace blink
 
 #endif  // CSSParserMode_h