Assert that convertToLength succeeds instead of returning Length(Undefined)

Source/core/rendering/style/BasicShapes.h

 /*
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  *
  * 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.
@@ skipping 63 matching lines @@
     Length height() const { return m_height; }
     Length cornerRadiusX() const { return m_cornerRadiusX; }
     Length cornerRadiusY() const { return m_cornerRadiusY; }
 
     void setX(Length x) { m_x = x; }
     void setY(Length y) { m_y = y; }
     void setWidth(Length width) { m_width = width; }
     void setHeight(Length height) { m_height = height; }
     void setCornerRadiusX(Length radiusX)
     {
-        ASSERT(!radiusX.isUndefined());
         m_cornerRadiusX = radiusX;
     }
     void setCornerRadiusY(Length radiusY)
     {
-        ASSERT(!radiusY.isUndefined());
         m_cornerRadiusY = radiusY;
     }
 
     virtual void path(Path&, const FloatRect&) OVERRIDE;
     virtual PassRefPtr<BasicShape> blend(const BasicShape*, double) const OVERRIDE;
 
     virtual Type type() const { return BasicShapeRectangleType; }
 private:
     BasicShapeRectangle() { }
 
@@ skipping 92 matching lines @@
     Length left() const { return m_left; }
     Length cornerRadiusX() const { return m_cornerRadiusX; }
     Length cornerRadiusY() const { return m_cornerRadiusY; }
 
     void setTop(Length top) { m_top = top; }
     void setRight(Length right) { m_right = right; }
     void setBottom(Length bottom) { m_bottom = bottom; }
     void setLeft(Length left) { m_left = left; }
     void setCornerRadiusX(Length radiusX)
     {
-        ASSERT(!radiusX.isUndefined());
         m_cornerRadiusX = radiusX;
     }
     void setCornerRadiusY(Length radiusY)
     {
-        ASSERT(!radiusY.isUndefined());
         m_cornerRadiusY = radiusY;
     }
 
     virtual void path(Path&, const FloatRect&) OVERRIDE;
     virtual PassRefPtr<BasicShape> blend(const BasicShape*, double) const OVERRIDE;
 
     virtual Type type() const { return BasicShapeInsetRectangleType; }
 private:
     BasicShapeInsetRectangle() { }
 
     Length m_right;
     Length m_top;
     Length m_bottom;
     Length m_left;
     Length m_cornerRadiusX;
     Length m_cornerRadiusY;
 };
 }
 #endif