Change HTMLTokenizer::Attribute::Range.start initial invalid value from 0 -> -1

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

 /*
  * Copyright (C) 2013 Google, 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 217 matching lines @@
     if (!size)
         return;
 
     m_attributes.clear();
     m_attributes.reserveInitialCapacity(size);
     for (size_t i = 0; i < size; ++i) {
         const HTMLToken::Attribute& attribute = attributes[i];
         if (attribute.nameAsVector().isEmpty())
             continue;
 
-        ASSERT(attribute.nameRange().start);
-        ASSERT(attribute.nameRange().end);
-        ASSERT(attribute.valueRange().start);
-        ASSERT(attribute.valueRange().end);
+        attribute.nameRange().checkValid();
+        attribute.valueRange().checkValid();
 
         AtomicString value(attribute.value8BitIfNecessary());
         const QualifiedName& name = nameForAttribute(attribute);
         // FIXME: This is N^2 for the number of attributes.
         if (!findAttributeInVector(m_attributes, name))
             m_attributes.append(Attribute(name, value));
     }
 }
 
 } // namespace blink
 
 #endif