Changed the default value of tabIndex of <fieldset> and <output> to be -1 as they are non-focusable…

third_party/WebKit/Source/core/html/HTMLOutputElement.cpp

 /*
  * Copyright (c) 2010 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 127 matching lines @@
 {
     if (m_defaultValue == value)
         return;
     m_defaultValue = value;
     // The spec requires the value attribute set to the default value
     // when the element's value mode flag to "default".
     if (m_isDefaultValueMode)
         setTextContent(value);
 }
 
+short HTMLOutputElement::tabIndex() const
+{
+    return -1;

[tkent, 2016/09/01 23:27:24]

We should return HTMLElement::tabIndex().

[lunalu1, 2016/09/02 01:07:38]

Done.

+}
 
 DEFINE_TRACE(HTMLOutputElement)
 {
     visitor->trace(m_tokens);
     HTMLFormControlElement::trace(visitor);
     DOMTokenListObserver::trace(visitor);
 }
 
 } // namespace blink