Introduce BorderImageLength and BorderImageLengthBox

Source/core/rendering/style/RenderStyle.cpp

Index: Source/core/rendering/style/RenderStyle.cpp
diff --git a/Source/core/rendering/style/RenderStyle.cpp b/Source/core/rendering/style/RenderStyle.cpp
index c7e0870bba01996abfa16c27a26bb990eb4b0ec1..b16d8f6d5feaa17de2531465837a90591aabdcc0 100644
--- a/Source/core/rendering/style/RenderStyle.cpp
+++ b/Source/core/rendering/style/RenderStyle.cpp
@@ -1613,16 +1613,16 @@ void RenderStyle::setBorderImageSlices(LengthBox slices)
 
 void RenderStyle::setBorderImageWidth(LengthBox slices)
 {
-    if (surround->border.m_image.borderSlices() == slices)
+    if (surround->border.m_image.borderSlices().deprecatedLengthBox() == slices)
         return;
-    surround.access()->border.m_image.setBorderSlices(slices);
+    surround.access()->border.m_image.setBorderSlices(BorderImageLengthBox(slices));
 }
 
 void RenderStyle::setBorderImageOutset(LengthBox outset)
 {
-    if (surround->border.m_image.outset() == outset)
+    if (surround->border.m_image.outset().deprecatedLengthBox() == outset)
         return;
-    surround.access()->border.m_image.setOutset(outset);
+    surround.access()->border.m_image.setOutset(BorderImageLengthBox(outset));
 }
 
 ShapeValue* RenderStyle::initialShapeInside()