FYI: Adds V8PrivateProperty::getOrUndefined().

third_party/WebKit/Source/modules/webgl/WebGLVertexArrayObjectBase.h

 // Copyright 2015 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.
 
 #ifndef WebGLVertexArrayObjectBase_h
 #define WebGLVertexArrayObjectBase_h
 
-#include "bindings/core/v8/ScopedPersistent.h"
 #include "modules/webgl/WebGLBuffer.h"
 #include "modules/webgl/WebGLContextObject.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class WebGLVertexArrayObjectBase : public WebGLContextObject {
 public:
     enum VaoType {
         VaoTypeDefault,
         VaoTypeUser,
     };
 
     ~WebGLVertexArrayObjectBase() override;
 
     GLuint object() const { return m_object; }
 
     bool isDefaultObject() const { return m_type == VaoTypeDefault; }
 
     bool hasEverBeenBound() const { return object() && m_hasEverBeenBound; }
     void setHasEverBeenBound() { m_hasEverBeenBound = true; }
 
     WebGLBuffer* boundElementArrayBuffer() const { return m_boundElementArrayBuffer; }
     void setElementArrayBuffer(WebGLBuffer*);
 
     WebGLBuffer* getArrayBufferForAttrib(size_t);
     void setArrayBufferForAttrib(GLuint, WebGLBuffer*);
     void unbindBuffer(WebGLBuffer*);
 
-    ScopedPersistent<v8::Array>* getPersistentCache();
-
     DECLARE_VIRTUAL_TRACE();
 
 protected:
     WebGLVertexArrayObjectBase(WebGLRenderingContextBase*, VaoType);
 
 private:
     void dispatchDetached(gpu::gles2::GLES2Interface*);
     bool hasObject() const override { return m_object != 0; }
     void deleteObjectImpl(gpu::gles2::GLES2Interface*) override;
 
     GLuint m_object;
 
     VaoType m_type;
     bool m_hasEverBeenBound;
     bool m_destructionInProgress;
     Member<WebGLBuffer> m_boundElementArrayBuffer;
     HeapVector<Member<WebGLBuffer>> m_arrayBufferList;
-
-    // For preserving the wrappers of WebGLBuffer objects latched in
-    // via vertexAttribPointer calls.
-    ScopedPersistent<v8::Array> m_arrayBufferWrappers;
 };
 
 } // namespace blink
 
 #endif // WebGLVertexArrayObjectBase_h