Remove the Element.prefix setter

Source/core/frame/UseCounter.cpp

 
 /*
  * Copyright (C) 2012 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
@@ skipping 753 matching lines @@
 
     case TreeWalkerExpandEntityReferences:
         return "'TreeWalker.expandEntityReferences' is deprecated and has been removed from DOM. It always returns false.";
 
     case RangeDetach:
         return "'Range.detach' is now a no-op, as per DOM (http://dom.spec.whatwg.org/#dom-range-detach).";
 
     case OverflowChangedEvent:
         return "The 'overflowchanged' event is deprecated and may be removed. Please do not use it.";
 
-    case ElementSetPrefix:
-        return "Setting 'Element.prefix' is deprecated, as it is read-only per DOM (http://dom.spec.whatwg.org/#element).";
-
     case SyncXHRWithCredentials:
         return "Setting 'XMLHttpRequest.withCredentials' for synchronous requests is deprecated.";
 
     case EventSourceURL:
         return "'EventSource.URL' is deprecated. Please use 'EventSource.url' instead.";
 
     case WebSocketURL:
         return "'WebSocket.URL' is deprecated. Please use 'WebSocket.url' instead.";
 
     case HTMLTableElementVspace:
@@ skipping 64 matching lines @@
 UseCounter* UseCounter::getFrom(const StyleSheetContents* sheetContents)
 {
     // FIXME: We may want to handle stylesheets that have multiple owners
     //        http://crbug.com/242125
     if (sheetContents && sheetContents->hasSingleOwnerNode())
         return getFrom(sheetContents->singleOwnerDocument());
     return 0;
 }
 
 } // namespace blink