Drop unused argument from one of the SVGTextMetrics constructors

Source/core/layout/svg/SVGTextMetrics.cpp

 /*
  * Copyright (C) Research In Motion Limited 2010-2012. 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 72 matching lines @@
     ASSERT(run.charactersLength() >= run.length());
     return run;
 }
 
 SVGTextMetrics SVGTextMetrics::measureCharacterRange(LayoutSVGInlineText* text, unsigned position, unsigned length, TextDirection textDirection)
 {
     ASSERT(text);
     return SVGTextMetrics(text, constructTextRun(text, position, length, textDirection));
 }
 
-SVGTextMetrics::SVGTextMetrics(LayoutSVGInlineText* text, unsigned position, unsigned length, float width)
+SVGTextMetrics::SVGTextMetrics(LayoutSVGInlineText* text, unsigned length, float width)
 {
     ASSERT(text);
 
     float scalingFactor = text->scalingFactor();
     ASSERT(scalingFactor);
 
     m_width = width / scalingFactor;
     m_height = text->scaledFont().fontMetrics().floatHeight() / scalingFactor;
 
     m_length = length;
 }
 
 }