[Oilpan] Migrate classes under module/webgl onto oilpan heap

Source/modules/webgl/WebGLVertexArrayObject.cpp

 // 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.
 
 #include "config.h"
 
 #include "modules/webgl/WebGLVertexArrayObject.h"
 
 #include "modules/webgl/WebGLRenderingContextBase.h"
 
 namespace blink {
 
-PassRefPtrWillBeRawPtr<WebGLVertexArrayObject> WebGLVertexArrayObject::create(WebGLRenderingContextBase* ctx, VaoType type)
+WebGLVertexArrayObject* WebGLVertexArrayObject::create(WebGLRenderingContextBase* ctx, VaoType type)
 {
-    return adoptRefWillBeNoop(new WebGLVertexArrayObject(ctx, type));
+    return new WebGLVertexArrayObject(ctx, type);
 }
 
 WebGLVertexArrayObject::WebGLVertexArrayObject(WebGLRenderingContextBase* ctx, VaoType type)
     : WebGLVertexArrayObjectBase(ctx, type)
 {
 }
 
 } // namespace blink