Change <menuitem> parsing rules to match spec

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

 /*
  * Copyright (C) 2010 Google, Inc. All Rights Reserved.
  * Copyright (C) 2011, 2014 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
@@ skipping 714 matching lines @@
         !type_attribute ||
         !DeprecatedEqualIgnoringCase(type_attribute->Value(), "hidden");
 
     tree_.ReconstructTheActiveFormattingElements();
     tree_.InsertSelfClosingHTMLElementDestroyingToken(token);
 
     if (disable_frameset)
       frameset_ok_ = false;
     return;
   }
-  if ((RuntimeEnabledFeatures::contextMenuEnabled() &&
-       token->GetName() == menuitemTag) ||
-      token->GetName() == paramTag || token->GetName() == sourceTag ||
+  if (token->GetName() == paramTag || token->GetName() == sourceTag ||
       token->GetName() == trackTag) {
     tree_.InsertSelfClosingHTMLElementDestroyingToken(token);
     return;
   }
   if (token->GetName() == hrTag) {
     ProcessFakePEndTagIfPInButtonScope();
     tree_.InsertSelfClosingHTMLElementDestroyingToken(token);
     frameset_ok_ = false;
     return;
   }
@@ skipping 2023 matching lines @@
     DEFINE_STRINGIFY(kAfterFramesetMode)
     DEFINE_STRINGIFY(kAfterAfterBodyMode)
     DEFINE_STRINGIFY(kAfterAfterFramesetMode)
 #undef DEFINE_STRINGIFY
   }
   return "<unknown>";
 }
 #endif
 
 }  // namespace blink