Make SVGLengthMode an enum class

Source/core/svg/SVGLength.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 24 matching lines @@
     AllowNegativeLengths,
     ForbidNegativeLengths
 };
 
 class SVGLengthTearOff;
 
 class SVGLength final : public SVGPropertyBase {
 public:
     typedef SVGLengthTearOff TearOffType;
 
-    static PassRefPtrWillBeRawPtr<SVGLength> create(SVGLengthMode mode = LengthModeOther)
+    static PassRefPtrWillBeRawPtr<SVGLength> create(SVGLengthMode mode = SVGLengthMode::Other)
     {
         return adoptRefWillBeNoop(new SVGLength(mode));
     }
 
     PassRefPtrWillBeRawPtr<SVGLength> clone() const;
     virtual PassRefPtrWillBeRawPtr<SVGPropertyBase> cloneForAnimation(const String&) const override;
 
     SVGLengthType unitType() const { return static_cast<SVGLengthType>(m_unitType); }
     CSSPrimitiveValue::UnitType cssUnitTypeQuirk() const
     {
@@ skipping 66 matching lines @@
 inline PassRefPtrWillBeRawPtr<SVGLength> toSVGLength(PassRefPtrWillBeRawPtr<SVGPropertyBase> passBase)
 {
     RefPtrWillBeRawPtr<SVGPropertyBase> base = passBase;
     ASSERT(base->type() == SVGLength::classType());
     return static_pointer_cast<SVGLength>(base.release());
 }
 
 } // namespace blink
 
 #endif // SVGLength_h