First part of work to move V8 binding integrity off of vtables.

Source/WebCore/svg/SVGMaskElement.cpp

Index: Source/WebCore/svg/SVGMaskElement.cpp
diff --git a/Source/WebCore/svg/SVGMaskElement.cpp b/Source/WebCore/svg/SVGMaskElement.cpp
index fc6a8bf006fe1114a61cf3cbefa48bea41d281e2..84c317a506aa973db8fa535babf6627424f17af8 100644
--- a/Source/WebCore/svg/SVGMaskElement.cpp
+++ b/Source/WebCore/svg/SVGMaskElement.cpp
@@ -69,6 +69,7 @@ inline SVGMaskElement::SVGMaskElement(const QualifiedName& tagName, Document* do
     // Spec: If the x/y attribute is not specified, the effect is as if a value of "-10%" were specified.
     // Spec: If the width/height attribute is not specified, the effect is as if a value of "120%" were specified.
     ASSERT(hasTagName(SVGNames::maskTag));
+    ScriptWrappable::init(this);
     registerAnimatedPropertiesForSVGMaskElement();
 }