Oilpan: revert SVG GC mixin constructor workaround.

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 992a79f6caa68c463764253694282e30d0a36b03..792da57cdaa3798f93a970fd14c451d81a34adfa 100644
--- a/Source/core/svg/SVGPatternElement.cpp
+++ b/Source/core/svg/SVGPatternElement.cpp
@@ -32,6 +32,9 @@ namespace blink {
 
 inline SVGPatternElement::SVGPatternElement(Document& document)
     : SVGElement(SVGNames::patternTag, document)
+    , SVGURIReference(this)
+    , SVGTests(this)
+    , SVGFitToViewBox(this)
     , 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))
@@ -40,10 +43,6 @@ inline SVGPatternElement::SVGPatternElement(Document& document)
     , 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))
 {
-    SVGURIReference::initialize(this);
-    SVGTests::initialize(this);
-    SVGFitToViewBox::initialize(this);
-
     addToPropertyMap(m_x);
     addToPropertyMap(m_y);
     addToPropertyMap(m_width);