Use Length for the stroke-width property in SVGLayoutStyle

Source/core/animation/animatable/AnimatableValueTestHelperTest.cpp

Index: Source/core/animation/animatable/AnimatableValueTestHelperTest.cpp
diff --git a/Source/core/animation/animatable/AnimatableValueTestHelperTest.cpp b/Source/core/animation/animatable/AnimatableValueTestHelperTest.cpp
index 1c6bdc2341050afea8414ba7c6254b9c73fdb4f8..e9814636235e770c24dde89655b1c4dcb3f66694 100644
--- a/Source/core/animation/animatable/AnimatableValueTestHelperTest.cpp
+++ b/Source/core/animation/animatable/AnimatableValueTestHelperTest.cpp
@@ -32,10 +32,8 @@
 
 #include "core/animation/animatable/AnimatableValueTestHelper.h"
 
-#include "bindings/core/v8/ExceptionStatePlaceholder.h"
 #include "core/layout/ClipPathOperation.h"
 #include "core/layout/style/BasicShapes.h"
-#include "core/svg/SVGLengthContext.h"
 #include "platform/transforms/ScaleTransformOperation.h"
 #include "platform/transforms/TranslateTransformOperation.h"
 
@@ -72,15 +70,6 @@ TEST_F(AnimationAnimatableValueTestHelperTest, PrintTo)
         PrintToString(const_cast<AnimatableValue*>(AnimatableValue::neutralValue())),
         testing::StartsWith("AnimatableNeutral@"));
 
-    RefPtrWillBeRawPtr<SVGLength> length1cm = SVGLength::create();
-    RefPtrWillBeRawPtr<SVGLength> length2cm = SVGLength::create();
-    length1cm->setValueAsString("1cm", ASSERT_NO_EXCEPTION);
-    length2cm->setValueAsString("2cm", ASSERT_NO_EXCEPTION);
-
-    EXPECT_EQ(
-        ::std::string("AnimatableSVGLength(1cm)"),
-        PrintToString(AnimatableSVGLength::create(length1cm)));
-
     EXPECT_THAT(
         PrintToString(AnimatableShapeValue::create(ShapeValue::createShapeValue(BasicShapeCircle::create().get(), ContentBox).get())),
         testing::StartsWith("AnimatableShapeValue@"));