Improve the reliability and accuracy of SVG getTotalLength

Source/platform/graphics/PathTraversalState.h

 /*
  * Copyright (C) 2006, 2007 Eric Seidel <eric@webkit.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 38 matching lines @@
     float cubicBezierTo(const FloatPoint& newControl1, const FloatPoint& newControl2, const FloatPoint& newEnd);
 
     void processSegment();
 
 public:
     PathTraversalAction m_action;
     bool m_success;
 
     FloatPoint m_current;
     FloatPoint m_start;
-    FloatPoint m_control1;
-    FloatPoint m_control2;
 
     float m_totalLength;
     unsigned m_segmentIndex;
     float m_desiredLength;
 
     // For normal calculations
     FloatPoint m_previous;
     float m_normalAngle; // degrees
 };
 }
 
 #endif