Undeprecate DocumentClear, CaptureEvents and ReleaseEvents

Source/core/html/HTMLDocument.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. 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
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 282 matching lines @@
     return attrSet;
 }
 
 bool HTMLDocument::isCaseSensitiveAttribute(const QualifiedName& attributeName)
 {
     static HashSet<StringImpl*>* htmlCaseInsensitiveAttributesSet = createHtmlCaseInsensitiveAttributesSet();
     bool isPossibleHTMLAttr = !attributeName.hasPrefix() && (attributeName.namespaceURI() == nullAtom);
     return !isPossibleHTMLAttr || !htmlCaseInsensitiveAttributesSet->contains(attributeName.localName().impl());
 }
 
-void HTMLDocument::clear()
-{
-    // FIXME: This does nothing, and that seems unlikely to be correct.
-    // We've long had a comment saying that IE doesn't support this.
-    // But I do see it in the documentation for Mozilla.
-}
-
 void HTMLDocument::write(DOMWindow* callingWindow, const Vector<String>& text)
 {
     ASSERT(callingWindow);
     StringBuilder builder;
     for (size_t i = 0; i < text.size(); ++i)
         builder.append(text[i]);
     write(builder.toString(), callingWindow->document());
 }
 
 void HTMLDocument::writeln(DOMWindow* callingWindow, const Vector<String>& text)
 {
     ASSERT(callingWindow);
     StringBuilder builder;
     for (size_t i = 0; i < text.size(); ++i)
         builder.append(text[i]);
     writeln(builder.toString(), callingWindow->document());
 }
 
 }