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

Source/WebCore/dom/MouseEvent.cpp

Index: Source/WebCore/dom/MouseEvent.cpp
diff --git a/Source/WebCore/dom/MouseEvent.cpp b/Source/WebCore/dom/MouseEvent.cpp
index faa91a15f634761dde5bd52e8fd24d879c568d88..d3ba8b91d1b4a7d96faa09c28bc182b74b716173 100644
--- a/Source/WebCore/dom/MouseEvent.cpp
+++ b/Source/WebCore/dom/MouseEvent.cpp
@@ -105,6 +105,7 @@ MouseEvent::MouseEvent()
     : m_button(0)
     , m_buttonDown(false)
 {
+    ScriptWrappable::init(this);
 }
 
 MouseEvent::MouseEvent(const AtomicString& eventType, bool canBubble, bool cancelable, PassRefPtr<AbstractView> view,
@@ -126,6 +127,7 @@ MouseEvent::MouseEvent(const AtomicString& eventType, bool canBubble, bool cance
     , m_relatedTarget(relatedTarget)
     , m_clipboard(clipboard)
 {
+    ScriptWrappable::init(this);
 }
 
 MouseEvent::MouseEvent(const AtomicString& eventType, const MouseEventInit& initializer)
@@ -140,6 +142,7 @@ MouseEvent::MouseEvent(const AtomicString& eventType, const MouseEventInit& init
     , m_relatedTarget(initializer.relatedTarget)
     , m_clipboard(0 /* clipboard */)
 {
+    ScriptWrappable::init(this);
     initCoordinates(IntPoint(initializer.clientX, initializer.clientY));
 }