Avoid conflict between 2 enums named Mode and 2 values named None.

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

 /*
  * Copyright (C) 2010 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 disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 380 matching lines @@
 
     if (quoteMark && (end == length))
       break;  // Close quote not found.
 
     return value.substring(pos, end - pos);
   }
 
   return "";
 }
 
-enum Mode {
+enum class MetaAttribute {
   None,
   Charset,
   Pragma,
 };
 
 WTF::TextEncoding encodingFromMetaAttributes(
     const HTMLAttributeList& attributes) {
   bool gotPragma = false;
-  Mode mode = None;
+  MetaAttribute mode = MetaAttribute::None;
   String charset;
 
   for (const auto& htmlAttribute : attributes) {
     const String& attributeName = htmlAttribute.first;
     const String& attributeValue = AtomicString(htmlAttribute.second);
 
     if (threadSafeMatch(attributeName, http_equivAttr)) {
       if (equalIgnoringCase(attributeValue, "content-type"))
         gotPragma = true;
     } else if (charset.isEmpty()) {
       if (threadSafeMatch(attributeName, charsetAttr)) {
         charset = attributeValue;
-        mode = Charset;
+        mode = MetaAttribute::Charset;
       } else if (threadSafeMatch(attributeName, contentAttr)) {
         charset = extractCharset(attributeValue);
         if (charset.length())
-          mode = Pragma;
+          mode = MetaAttribute::Pragma;
       }
     }
   }
 
-  if (mode == Charset || (mode == Pragma && gotPragma))
+  if (mode == MetaAttribute::Charset ||
+      (mode == MetaAttribute::Pragma && gotPragma))
     return WTF::TextEncoding(stripLeadingAndTrailingHTMLSpaces(charset));
 
   return WTF::TextEncoding();
 }
 
 static bool threadSafeEqual(const StringImpl* a, const StringImpl* b) {
   if (a == b)
     return true;
   if (a->hash() != b->hash())
     return false;
@@ skipping 48 matching lines @@
     string = StringImpl::create8BitIfPossible(characters, size);
   else if (width == Force8Bit)
     string = String::make8BitFrom16BitSource(characters, size);
   else
     string = String(characters, size);
 
   return string;
 }
 
 }  // namespace blink