Oilpan: revert SVG GC mixin constructor workaround.

Source/core/svg/SVGFEImageElement.cpp

Index: Source/core/svg/SVGFEImageElement.cpp
diff --git a/Source/core/svg/SVGFEImageElement.cpp b/Source/core/svg/SVGFEImageElement.cpp
index a594c1671a9d6cf1c1f588cf89020643615a411b..8c05eef7a993d39bcf05d80aad674c0d78f8370c 100644
--- a/Source/core/svg/SVGFEImageElement.cpp
+++ b/Source/core/svg/SVGFEImageElement.cpp
@@ -35,10 +35,9 @@ namespace blink {
 
 inline SVGFEImageElement::SVGFEImageElement(Document& document)
     : SVGFilterPrimitiveStandardAttributes(SVGNames::feImageTag, document)
+    , SVGURIReference(this)
     , m_preserveAspectRatio(SVGAnimatedPreserveAspectRatio::create(this, SVGNames::preserveAspectRatioAttr, SVGPreserveAspectRatio::create()))
 {
-    SVGURIReference::initialize(this);
-
     addToPropertyMap(m_preserveAspectRatio);
 }