Have bindings layer assume and insist that all interface types are GCed.

third_party/WebKit/Source/bindings/core/v8/V8DOMWrapper.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 41 matching lines @@
     static v8::Local<v8::Object> createWrapper(v8::Isolate*, v8::Local<v8::Object> creationContext, const WrapperTypeInfo*, ScriptWrappable*);
     static bool isWrapper(v8::Isolate*, v8::Local<v8::Value>);
 
     // Associates the given ScriptWrappable with the given |wrapper| if the
     // ScriptWrappable is not yet associated with any wrapper.  Returns the
     // wrapper already associated or |wrapper| if not yet associated.
     // The caller should always use the returned value rather than |wrapper|.
     static v8::Local<v8::Object> associateObjectWithWrapper(v8::Isolate*, ScriptWrappable*, const WrapperTypeInfo*, v8::Local<v8::Object> wrapper) WARN_UNUSED_RETURN;
     static v8::Local<v8::Object> associateObjectWithWrapper(v8::Isolate*, Node*, const WrapperTypeInfo*, v8::Local<v8::Object> wrapper) WARN_UNUSED_RETURN;
     static void setNativeInfo(v8::Local<v8::Object>, const WrapperTypeInfo*, ScriptWrappable*);
-    static void clearNativeInfo(v8::Local<v8::Object>, const WrapperTypeInfo*);
     // hasInternalFieldsSet only checks if the value has the internal fields for
     // wrapper obejct and type, and does not check if it's valid or not.  The
     // value may not be a Blink's wrapper object.  In order to make sure of it,
     // Use isWrapper function instead.
     CORE_EXPORT static bool hasInternalFieldsSet(v8::Local<v8::Value>);
 };
 
 inline void V8DOMWrapper::setNativeInfo(v8::Local<v8::Object> wrapper, const WrapperTypeInfo* wrapperTypeInfo, ScriptWrappable* scriptWrappable)
 {
     ASSERT(wrapper->InternalFieldCount() >= 2);
     ASSERT(scriptWrappable);
     ASSERT(wrapperTypeInfo);
     wrapper->SetAlignedPointerInInternalField(v8DOMWrapperObjectIndex, scriptWrappable);
     wrapper->SetAlignedPointerInInternalField(v8DOMWrapperTypeIndex, const_cast<WrapperTypeInfo*>(wrapperTypeInfo));
 }
 
-inline void V8DOMWrapper::clearNativeInfo(v8::Local<v8::Object> wrapper, const WrapperTypeInfo* wrapperTypeInfo)
-{
-    ASSERT(wrapper->InternalFieldCount() >= 2);
-    ASSERT(wrapperTypeInfo);
-    // clearNativeInfo() is used only by NP objects, which are not garbage collected.
-    ASSERT(wrapperTypeInfo->gcType == WrapperTypeInfo::RefCountedObject);
-    wrapper->SetAlignedPointerInInternalField(v8DOMWrapperTypeIndex, const_cast<WrapperTypeInfo*>(wrapperTypeInfo));
-    wrapper->SetAlignedPointerInInternalField(v8DOMWrapperObjectIndex, 0);
-}
-
 inline v8::Local<v8::Object> V8DOMWrapper::associateObjectWithWrapper(v8::Isolate* isolate, ScriptWrappable* impl, const WrapperTypeInfo* wrapperTypeInfo, v8::Local<v8::Object> wrapper)
 {
     if (DOMDataStore::setWrapper(isolate, impl, wrapperTypeInfo, wrapper)) {
-        wrapperTypeInfo->refObject(impl);
+        wrapperTypeInfo->refObject();
         setNativeInfo(wrapper, wrapperTypeInfo, impl);
         ASSERT(hasInternalFieldsSet(wrapper));
     }
     SECURITY_CHECK(toScriptWrappable(wrapper) == impl);
     return wrapper;
 }
 
 inline v8::Local<v8::Object> V8DOMWrapper::associateObjectWithWrapper(v8::Isolate* isolate, Node* node, const WrapperTypeInfo* wrapperTypeInfo, v8::Local<v8::Object> wrapper)
 {
     if (DOMDataStore::setWrapper(isolate, node, wrapperTypeInfo, wrapper)) {
-        wrapperTypeInfo->refObject(ScriptWrappable::fromNode(node));
+        wrapperTypeInfo->refObject();
         setNativeInfo(wrapper, wrapperTypeInfo, ScriptWrappable::fromNode(node));
         ASSERT(hasInternalFieldsSet(wrapper));
     }
     SECURITY_CHECK(toScriptWrappable(wrapper) == ScriptWrappable::fromNode(node));
     return wrapper;
 }
 
 class V8WrapperInstantiationScope {
     STACK_ALLOCATED();
 public:
@@ skipping 48 matching lines @@
 
     bool m_didEnterContext;
     v8::Local<v8::Context> m_context;
     v8::TryCatch m_tryCatch;
     bool m_convertExceptions;
 };
 
 } // namespace blink
 
 #endif // V8DOMWrapper_h