Make SVGLengthMode an enum class

Source/core/svg/SVGCircleElement.cpp

Index: Source/core/svg/SVGCircleElement.cpp
diff --git a/Source/core/svg/SVGCircleElement.cpp b/Source/core/svg/SVGCircleElement.cpp
index 7352516e9398ca17d3dac823fc6e80ae1875149c..1a8a4f7ce539f99cf992b593f428903bdd5c9375 100644
--- a/Source/core/svg/SVGCircleElement.cpp
+++ b/Source/core/svg/SVGCircleElement.cpp
@@ -28,9 +28,9 @@ namespace blink {
 
 inline SVGCircleElement::SVGCircleElement(Document& document)
     : SVGGeometryElement(SVGNames::circleTag, document)
-    , m_cx(SVGAnimatedLength::create(this, SVGNames::cxAttr, SVGLength::create(LengthModeWidth), AllowNegativeLengths))
-    , m_cy(SVGAnimatedLength::create(this, SVGNames::cyAttr, SVGLength::create(LengthModeHeight), AllowNegativeLengths))
-    , m_r(SVGAnimatedLength::create(this, SVGNames::rAttr, SVGLength::create(LengthModeOther), ForbidNegativeLengths))
+    , m_cx(SVGAnimatedLength::create(this, SVGNames::cxAttr, SVGLength::create(SVGLengthMode::Width), AllowNegativeLengths))
+    , m_cy(SVGAnimatedLength::create(this, SVGNames::cyAttr, SVGLength::create(SVGLengthMode::Height), AllowNegativeLengths))
+    , m_r(SVGAnimatedLength::create(this, SVGNames::rAttr, SVGLength::create(SVGLengthMode::Other), ForbidNegativeLengths))
 {
     addToPropertyMap(m_cx);
     addToPropertyMap(m_cy);