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

Source/WebCore/dom/ProgressEvent.cpp

Index: Source/WebCore/dom/ProgressEvent.cpp
diff --git a/Source/WebCore/dom/ProgressEvent.cpp b/Source/WebCore/dom/ProgressEvent.cpp
index fe8351bc15a017f1a73ad7d5b41ca454e315e475..2df38731b693e011126070b91da6a320af85647b 100644
--- a/Source/WebCore/dom/ProgressEvent.cpp
+++ b/Source/WebCore/dom/ProgressEvent.cpp
@@ -42,6 +42,7 @@ ProgressEvent::ProgressEvent()
     , m_loaded(0)
     , m_total(0)
 {
+    ScriptWrappable::init(this);
 }
 
 ProgressEvent::ProgressEvent(const AtomicString& type, const ProgressEventInit& initializer)
@@ -50,6 +51,7 @@ ProgressEvent::ProgressEvent(const AtomicString& type, const ProgressEventInit&
     , m_loaded(initializer.loaded)
     , m_total(initializer.total)
 {
+    ScriptWrappable::init(this);
 }
 
 ProgressEvent::ProgressEvent(const AtomicString& type, bool lengthComputable, unsigned long long loaded, unsigned long long total)
@@ -58,6 +60,7 @@ ProgressEvent::ProgressEvent(const AtomicString& type, bool lengthComputable, un
     , m_loaded(loaded)
     , m_total(total)
 {
+    ScriptWrappable::init(this);
 }
     
 const AtomicString& ProgressEvent::interfaceName() const