Make SVGLengthMode an enum class

Source/core/svg/SVGLengthContext.cpp

Index: Source/core/svg/SVGLengthContext.cpp
diff --git a/Source/core/svg/SVGLengthContext.cpp b/Source/core/svg/SVGLengthContext.cpp
index d3c537291c19a43229131a3c3e7700ba6bac1d93..4f229d37b1ff000f0601d32346b4a59b73e4cd05 100644
--- a/Source/core/svg/SVGLengthContext.cpp
+++ b/Source/core/svg/SVGLengthContext.cpp
@@ -35,11 +35,11 @@ namespace blink {
 static inline float dimensionForLengthMode(SVGLengthMode mode, const FloatSize& viewportSize)
 {
     switch (mode) {
-    case LengthModeWidth:
+    case SVGLengthMode::Width:
         return viewportSize.width();
-    case LengthModeHeight:
+    case SVGLengthMode::Height:
         return viewportSize.height();
-    case LengthModeOther:
+    case SVGLengthMode::Other:
         return sqrtf(viewportSize.diagonalLengthSquared() / 2);
     }
     ASSERT_NOT_REACHED();