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

Source/WebCore/dom/CompositionEvent.cpp

Index: Source/WebCore/dom/CompositionEvent.cpp
diff --git a/Source/WebCore/dom/CompositionEvent.cpp b/Source/WebCore/dom/CompositionEvent.cpp
index 9eb5d3914f5ae2fbf6f8dca602d008bf2173b639..8dcdca9d52a41ff81df8e0a20f459b0b2fbb8c50 100644
--- a/Source/WebCore/dom/CompositionEvent.cpp
+++ b/Source/WebCore/dom/CompositionEvent.cpp
@@ -37,18 +37,21 @@ CompositionEventInit::CompositionEventInit()
 
 CompositionEvent::CompositionEvent()
 {
+    ScriptWrappable::init(this);
 }
 
 CompositionEvent::CompositionEvent(const AtomicString& type, PassRefPtr<AbstractView> view, const String& data)
     : UIEvent(type, true, true, view, 0)
     , m_data(data)
 {
+    ScriptWrappable::init(this);
 }
 
 CompositionEvent::CompositionEvent(const AtomicString& type, const CompositionEventInit& initializer)
     : UIEvent(type, initializer)
     , m_data(initializer.data)
 {
+    ScriptWrappable::init(this);
 }
 
 CompositionEvent::~CompositionEvent()