Make SVGLengthMode an enum class

Source/core/svg/SVGLengthContext.cpp

 /*
  * Copyright (C) 2004, 2005, 2006 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 17 matching lines @@
 #include "core/layout/style/LayoutStyle.h"
 #include "core/svg/SVGSVGElement.h"
 #include "platform/LengthFunctions.h"
 #include "platform/fonts/FontMetrics.h"
 
 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();
     return 0;
 }
 
 static float convertValueFromPercentageToUserUnits(const SVGLength& value, const FloatSize& viewportSize)
 {
     return value.scaleByPercentage(dimensionForLengthMode(value.unitMode(), viewportSize));
 }
@@ skipping 215 matching lines @@
 
     const SVGSVGElement& svg = toSVGSVGElement(*viewportElement);
     viewportSize = svg.currentViewBoxRect().size();
     if (viewportSize.isEmpty())
         viewportSize = svg.currentViewportSize();
 
     return true;
 }
 
 }