Parse comments according to parsing.md

sky/engine/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 110 matching lines @@
     // NOTE: flush() can cause any queued tasks to execute, possibly re-entering the parser.
     m_tree.flush();
 
     if (type == HTMLToken::StartTag) {
         processStartTag(token);
     } else if (type == HTMLToken::EndTag) {
         processEndTag(token);
     } else if (type == HTMLToken::EndOfFile) {
         processEndOfFile(token);
     } else {
-        // We ignore Comments.
-        ASSERT(type == HTMLToken::Comment);
+        ASSERT_NOT_REACHED();
     }
 
     m_tree.executeQueuedTasks();
     // We might be detached now.
 }
 
 void HTMLTreeBuilder::processStartTag(AtomicHTMLToken* token)
 {
     ASSERT(token->type() == HTMLToken::StartTag);
     const AtomicString& name = token->name();
@@ skipping 74 matching lines @@
 void HTMLTreeBuilder::finished()
 {
     if (isParsingFragment())
         return;
     ASSERT(m_isAttached);
     // Warning, this may detach the parser. Do not do anything else after this.
     m_tree.finishedParsing();
 }
 
 } // namespace blink