Implement aria-placeholder

third_party/WebKit/public/web/WebAXEnums.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:
  *
  *     * 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 299 matching lines @@
   WebAXNameFromTitle,
 };
 
 // The source of the accessible description of an element. This is needed
 // because on some platforms this determines how the accessible description
 // is exposed.
 enum WebAXDescriptionFrom {
   WebAXDescriptionFromUninitialized = -1,
   WebAXDescriptionFromAttribute = 0,
   WebAXDescriptionFromContents,
-  WebAXDescriptionFromPlaceholder,
   WebAXDescriptionFromRelatedElement,
 };
 
 // Text affinity for the start or end of a selection.
 enum WebAXTextAffinity {
   WebAXTextAffinityUpstream,
   WebAXTextAffinityDownstream
 };
 
 }  // namespace blink
 
 #endif