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

third_party/WebKit/Source/bindings/core/v8/ScriptWrappable.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "bindings/core/v8/ScriptWrappable.h"
 
 #include "bindings/core/v8/DOMDataStore.h"
 #include "bindings/core/v8/V8DOMWrapper.h"
 
 namespace blink {
 
 struct SameSizeAsScriptWrappable {
     virtual ~SameSizeAsScriptWrappable() { }
     v8::Persistent<v8::Object> m_wrapper;
 };
 
 static_assert(sizeof(ScriptWrappable) <= sizeof(SameSizeAsScriptWrappable), "ScriptWrappable should stay small");
 
-namespace {
-
-class ScriptWrappableProtector final {
-    WTF_MAKE_NONCOPYABLE(ScriptWrappableProtector);
-public:
-    ScriptWrappableProtector(ScriptWrappable* scriptWrappable, const WrapperTypeInfo* wrapperTypeInfo)
-        : m_scriptWrappable(scriptWrappable), m_wrapperTypeInfo(wrapperTypeInfo)
-    {
-        m_wrapperTypeInfo->refObject(m_scriptWrappable);
-    }
-    ~ScriptWrappableProtector()
-    {
-        m_wrapperTypeInfo->derefObject(m_scriptWrappable);
-    }
-
-private:
-    ScriptWrappable* m_scriptWrappable;
-    const WrapperTypeInfo* m_wrapperTypeInfo;
-};
-
-} // namespace
-
 v8::Local<v8::Object> ScriptWrappable::wrap(v8::Isolate* isolate, v8::Local<v8::Object> creationContext)
 {
     const WrapperTypeInfo* wrapperTypeInfo = this->wrapperTypeInfo();
 
-    // It's possible that no one except for the new wrapper owns this object at
-    // this moment, so we have to prevent GC to collect this object until the
-    // object gets associated with the wrapper.
-    ScriptWrappableProtector protect(this, wrapperTypeInfo);
-
     ASSERT(!DOMDataStore::containsWrapper(this, isolate));
 
     v8::Local<v8::Object> wrapper = V8DOMWrapper::createWrapper(isolate, creationContext, wrapperTypeInfo, this);
     if (UNLIKELY(wrapper.IsEmpty()))
         return wrapper;
 
     wrapperTypeInfo->installConditionallyEnabledProperties(wrapper, isolate);
     return associateWithWrapper(isolate, wrapperTypeInfo, wrapper);
 }
 
 v8::Local<v8::Object> ScriptWrappable::associateWithWrapper(v8::Isolate* isolate, const WrapperTypeInfo* wrapperTypeInfo, v8::Local<v8::Object> wrapper)
 {
     return V8DOMWrapper::associateObjectWithWrapper(isolate, this, wrapperTypeInfo, wrapper);
 }
 
 } // namespace blink