Remove Backslash-as-JPY hack

Source/core/frame/Frame.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Simon Hausmann <hausmann@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  *                     2001 George Staikos <staikos@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2005 Alexey Proskuryakov <ap@nypop.com>
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 349 matching lines @@
 }
 
 String Frame::documentTypeString() const
 {
     if (DocumentType* doctype = document()->doctype())
         return createMarkup(doctype);
 
     return String();
 }
 
-String Frame::displayStringModifiedByEncoding(const String& str) const
-{
-    return document() ? document()->displayStringModifiedByEncoding(str) : str;
-}
-
 String Frame::selectedText() const
 {
     return selection().selectedText();
 }
 
 String Frame::selectedTextForClipboard() const
 {
     return selection().selectedTextForClipboard();
 }
 
@@ skipping 297 matching lines @@
     if (!m_page)
         return 0;
 
     double ratio = m_page->deviceScaleFactor();
     if (RuntimeEnabledFeatures::devicePixelRatioIncludesZoomEnabled())
         ratio *= pageZoomFactor();
     return ratio;
 }
 
 } // namespace WebCore