Avoid useless initialization in ScrollAnimatorNone::PerAxisData::animateScroll()

Source/platform/scroll/ScrollAnimatorNone.h

Index: Source/platform/scroll/ScrollAnimatorNone.h
diff --git a/Source/platform/scroll/ScrollAnimatorNone.h b/Source/platform/scroll/ScrollAnimatorNone.h
index d1cbeb434a1f9b64f54f90a3549a4930503737b1..a72b636044552624152f6dd3f948c9077c2ba89f 100644
--- a/Source/platform/scroll/ScrollAnimatorNone.h
+++ b/Source/platform/scroll/ScrollAnimatorNone.h
@@ -111,6 +111,8 @@ protected:
         static double attackArea(Curve, double startT, double endT);
         static double releaseArea(Curve, double startT, double endT);
 
+        double newScrollAnimationPosition(double deltaTime);
+
         float* m_currentPosition;
         double m_currentVelocity;