Make SVGLengthMode an enum class

Source/core/svg/SVGLineElement.cpp

Index: Source/core/svg/SVGLineElement.cpp
diff --git a/Source/core/svg/SVGLineElement.cpp b/Source/core/svg/SVGLineElement.cpp
index 5da99e784c16e2da51d99057330948b2f9e15198..0a8bdadd57d6710c2d0f0545a68b2e1e19154c89 100644
--- a/Source/core/svg/SVGLineElement.cpp
+++ b/Source/core/svg/SVGLineElement.cpp
@@ -28,10 +28,10 @@ namespace blink {
 
 inline SVGLineElement::SVGLineElement(Document& document)
     : SVGGeometryElement(SVGNames::lineTag, document)
-    , m_x1(SVGAnimatedLength::create(this, SVGNames::x1Attr, SVGLength::create(LengthModeWidth), AllowNegativeLengths))
-    , m_y1(SVGAnimatedLength::create(this, SVGNames::y1Attr, SVGLength::create(LengthModeHeight), AllowNegativeLengths))
-    , m_x2(SVGAnimatedLength::create(this, SVGNames::x2Attr, SVGLength::create(LengthModeWidth), AllowNegativeLengths))
-    , m_y2(SVGAnimatedLength::create(this, SVGNames::y2Attr, SVGLength::create(LengthModeHeight), AllowNegativeLengths))
+    , m_x1(SVGAnimatedLength::create(this, SVGNames::x1Attr, SVGLength::create(SVGLengthMode::Width), AllowNegativeLengths))
+    , m_y1(SVGAnimatedLength::create(this, SVGNames::y1Attr, SVGLength::create(SVGLengthMode::Height), AllowNegativeLengths))
+    , m_x2(SVGAnimatedLength::create(this, SVGNames::x2Attr, SVGLength::create(SVGLengthMode::Width), AllowNegativeLengths))
+    , m_y2(SVGAnimatedLength::create(this, SVGNames::y2Attr, SVGLength::create(SVGLengthMode::Height), AllowNegativeLengths))
 {
     addToPropertyMap(m_x1);
     addToPropertyMap(m_y1);