Make SVGLengthMode an enum class

Source/core/svg/SVGPatternElement.cpp

Index: Source/core/svg/SVGPatternElement.cpp
diff --git a/Source/core/svg/SVGPatternElement.cpp b/Source/core/svg/SVGPatternElement.cpp
index 5442158e278afd75493874711c2e1c71c0332d16..8b83b69911be05e668b2382957e693ce3551282c 100644
--- a/Source/core/svg/SVGPatternElement.cpp
+++ b/Source/core/svg/SVGPatternElement.cpp
@@ -32,10 +32,10 @@ namespace blink {
 
 inline SVGPatternElement::SVGPatternElement(Document& document)
     : SVGElement(SVGNames::patternTag, document)
-    , m_x(SVGAnimatedLength::create(this, SVGNames::xAttr, SVGLength::create(LengthModeWidth), AllowNegativeLengths))
-    , m_y(SVGAnimatedLength::create(this, SVGNames::yAttr, SVGLength::create(LengthModeHeight), AllowNegativeLengths))
-    , m_width(SVGAnimatedLength::create(this, SVGNames::widthAttr, SVGLength::create(LengthModeWidth), ForbidNegativeLengths))
-    , m_height(SVGAnimatedLength::create(this, SVGNames::heightAttr, SVGLength::create(LengthModeHeight), ForbidNegativeLengths))
+    , m_x(SVGAnimatedLength::create(this, SVGNames::xAttr, SVGLength::create(SVGLengthMode::Width), AllowNegativeLengths))
+    , m_y(SVGAnimatedLength::create(this, SVGNames::yAttr, SVGLength::create(SVGLengthMode::Height), AllowNegativeLengths))
+    , m_width(SVGAnimatedLength::create(this, SVGNames::widthAttr, SVGLength::create(SVGLengthMode::Width), ForbidNegativeLengths))
+    , m_height(SVGAnimatedLength::create(this, SVGNames::heightAttr, SVGLength::create(SVGLengthMode::Height), ForbidNegativeLengths))
     , m_patternTransform(SVGAnimatedTransformList::create(this, SVGNames::patternTransformAttr, SVGTransformList::create()))
     , m_patternUnits(SVGAnimatedEnumeration<SVGUnitTypes::SVGUnitType>::create(this, SVGNames::patternUnitsAttr, SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX))
     , m_patternContentUnits(SVGAnimatedEnumeration<SVGUnitTypes::SVGUnitType>::create(this, SVGNames::patternContentUnitsAttr, SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE))