Harden ScriptWrappable against ref count bugs

Source/bindings/v8/ScriptWrappable.h

Index: Source/bindings/v8/ScriptWrappable.h
diff --git a/Source/bindings/v8/ScriptWrappable.h b/Source/bindings/v8/ScriptWrappable.h
index 27f119908cbde3648b449c69879912fde1ac6e74..91ba8cdc3554eb29c4c6a71a27062eb6d8898872 100644
--- a/Source/bindings/v8/ScriptWrappable.h
+++ b/Source/bindings/v8/ScriptWrappable.h
@@ -146,6 +146,9 @@ public:
 protected:
     ~ScriptWrappable()
     {
+        // We must not get deleted as long as we contain a wrapper. If this happens, we screwed up ref
+        // counting somewhere. Crash here instead of crashing during a later gc cycle.
+        RELEASE_ASSERT_WITH_SECURITY_IMPLICATION(!containsWrapper());
         ASSERT(m_wrapperOrTypeInfo);  // Assert initialization via init() even if not subsequently wrapped.
         m_wrapperOrTypeInfo = 0;      // Break UAF attempts to wrap.
     }