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diff --git a/js/src/vm/PlainObject.h b/js/src/vm/PlainObject.h
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+++ b/js/src/vm/PlainObject.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef vm_PlainObject_h
+#define vm_PlainObject_h
+
+#include "gc/AllocKind.h"     // js::gc::AllocKind
+#include "js/Class.h"         // JSClass
+#include "js/Result.h"        // JS::OOM, JS::Result
+#include "js/RootingAPI.h"    // JS::Handle
+#include "vm/NativeObject.h"  // js::NativeObject
+#include "vm/ObjectGroup.h"   // js::NewObjectKind
+
+struct JS_PUBLIC_API JSContext;
+class JS_PUBLIC_API JSFunction;
+class JS_PUBLIC_API JSObject;
+
+namespace js {
+
+// Object class for plain native objects created using '{}' object literals,
+// 'new Object()', 'Object.create', etc.
+class PlainObject : public NativeObject {
+ public:
+  static const JSClass class_;
+
+  static inline JS::Result<PlainObject*, JS::OOM> createWithTemplate(
+      JSContext* cx, JS::Handle<PlainObject*> templateObject);
+
+  /* Return the allocKind we would use if we were to tenure this object. */
+  inline gc::AllocKind allocKindForTenure() const;
+};
+
+// Specializations of 7.3.23 CopyDataProperties(...) for NativeObjects.
+extern bool CopyDataPropertiesNative(JSContext* cx,
+                                     JS::Handle<PlainObject*> target,
+                                     JS::Handle<NativeObject*> from,
+                                     JS::Handle<PlainObject*> excludedItems,
+                                     bool* optimized);
+
+// Specialized call for constructing |this| with a known function callee.
+extern PlainObject* CreateThisForFunction(JSContext* cx,
+                                          JS::Handle<JSFunction*> callee,
+                                          JS::Handle<JSObject*> newTarget,
+                                          NewObjectKind newKind);
+
+}  // namespace js
+
+#endif  // vm_PlainObject_h