[CSS Shapes] shape-margin in percentage units always computes to 0px

Source/core/rendering/shapes/BoxShapeTest.cpp

 /*
  * Copyright (C) 2013 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 25 matching lines @@
 #include <gtest/gtest.h>
 
 namespace WebCore {
 
 class BoxShapeTest : public ::testing::Test {
 protected:
     BoxShapeTest() { }
 
     PassOwnPtr<Shape> createBoxShape(const RoundedRect& bounds, float shapeMargin)
     {
-        return Shape::createLayoutBoxShape(bounds, TopToBottomWritingMode, Length(shapeMargin, Fixed));
+        return Shape::createLayoutBoxShape(bounds, TopToBottomWritingMode, shapeMargin);
     }
 };
 
 } // namespace WebCore
 
 namespace {
 
 using namespace WebCore;
 
 #define TEST_EXCLUDED_INTERVAL(shapePtr, lineTop, lineHeight, expectedLeft, expectedRight) \
@@ skipping 77 matching lines @@
 
     TEST_EXCLUDED_INTERVAL(shape, 10, 95, 0, 100);
     TEST_EXCLUDED_INTERVAL(shape, 5, 25, 0, 100);
     TEST_EXCLUDED_INTERVAL(shape, 15, 6, 0, 100);
     TEST_EXCLUDED_INTERVAL(shape, 20, 50, 0, 100);
     TEST_EXCLUDED_INTERVAL(shape, 69, 5, 0, 100);
     TEST_EXCLUDED_INTERVAL(shape, 85, 10, 0, 97.320511f);
 }
 
 } // namespace