Remove calculateStdDeviation function from Blur effect.

Source/platform/graphics/filters/FEGaussianBlur.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  * Copyright (C) 2005 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) 2010 Igalia, S.L.
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 344 matching lines @@
 TextStream& FEGaussianBlur::externalRepresentation(TextStream& ts, int indent) const
 {
     writeIndent(ts, indent);
     ts << "[feGaussianBlur";
     FilterEffect::externalRepresentation(ts);
     ts << " stdDeviation=\"" << m_stdX << ", " << m_stdY << "\"]\n";
     inputEffect(0)->externalRepresentation(ts, indent + 1);
     return ts;
 }
 
-float FEGaussianBlur::calculateStdDeviation(float radius)
-{
-    // Blur radius represents 2/3 times the kernel size, the dest pixel is half of the radius applied 3 times
-    return max((radius * 2 / 3.f - 0.5f) / gaussianKernelFactor(), 0.f);
-}
-
 } // namespace WebCore