Oilpan: revert SVG GC mixin constructor workaround.

Source/core/svg/SVGGraphicsElement.cpp

Index: Source/core/svg/SVGGraphicsElement.cpp
diff --git a/Source/core/svg/SVGGraphicsElement.cpp b/Source/core/svg/SVGGraphicsElement.cpp
index 0bf9c9c53bd3c900b59814f9dd4d687b4e60d23a..690553f60720ecea4a0c3181afa8735b54dbb07f 100644
--- a/Source/core/svg/SVGGraphicsElement.cpp
+++ b/Source/core/svg/SVGGraphicsElement.cpp
@@ -34,10 +34,9 @@ namespace blink {
 
 SVGGraphicsElement::SVGGraphicsElement(const QualifiedName& tagName, Document& document, ConstructionType constructionType)
     : SVGElement(tagName, document, constructionType)
+    , SVGTests(this)
     , m_transform(SVGAnimatedTransformList::create(this, SVGNames::transformAttr, SVGTransformList::create()))
 {
-    SVGTests::initialize(this);
-
     addToPropertyMap(m_transform);
 }