Revert of "Implement the inert attribute"

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004-2008, 2013, 2014 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2011 Motorola Mobility. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 445 matching lines @@
 }
 
 void HTMLElement::ParseAttribute(const AttributeModificationParams& params) {
   if (params.name == tabindexAttr || params.name == XMLNames::langAttr)
     return Element::ParseAttribute(params);
 
   if (params.name == dirAttr) {
     DirAttributeChanged(params.new_value);
   } else if (params.name == langAttr) {
     PseudoStateChanged(CSSSelector::kPseudoLang);
-  } else if (params.name == inertAttr) {
-    UseCounter::Count(GetDocument(), UseCounter::kInertAttribute);
   } else {
     const AtomicString& event_name = EventNameForAttributeName(params.name);
     if (!event_name.IsNull()) {
       SetAttributeEventListener(
           event_name,
           CreateAttributeEventListener(this, params.name, params.new_value,
                                        EventParameterName()));
     }
   }
 }
@@ skipping 744 matching lines @@
 
 #ifndef NDEBUG
 
 // For use in the debugger
 void dumpInnerHTML(blink::HTMLElement*);
 
 void dumpInnerHTML(blink::HTMLElement* element) {
   printf("%s\n", element->innerHTML().Ascii().data());
 }
 #endif