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diff --git a/js/xpconnect/wrappers/AccessCheck.h b/js/xpconnect/wrappers/AccessCheck.h
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+++ b/js/xpconnect/wrappers/AccessCheck.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 __AccessCheck_h__
+#define __AccessCheck_h__
+
+#include "js/Id.h"
+#include "js/Wrapper.h"
+#include "nsString.h"
+
+#ifdef XP_MACOSX
+// AssertMacros.h defines 'check' which conflicts with the method declarations
+// in this file.
+#  undef check
+#endif
+
+namespace xpc {
+
+class AccessCheck {
+ public:
+  static bool subsumes(JSObject* a, JSObject* b);
+  static bool wrapperSubsumes(JSObject* wrapper);
+  static bool subsumesConsideringDomain(JS::Realm* a, JS::Realm* b);
+  static bool subsumesConsideringDomainIgnoringFPD(JS::Realm* a, JS::Realm* b);
+  static bool isChrome(JS::Compartment* compartment);
+  static bool isChrome(JS::Realm* realm);
+  static bool isChrome(JSObject* obj);
+  static bool checkPassToPrivilegedCode(JSContext* cx, JS::HandleObject wrapper,
+                                        JS::HandleValue value);
+  static bool checkPassToPrivilegedCode(JSContext* cx, JS::HandleObject wrapper,
+                                        const JS::CallArgs& args);
+  // Called to report the correct sort of exception when our policy denies and
+  // should throw.  The accessType argument should be one of "access",
+  // "define", "delete", depending on which operation is being denied.
+  static void reportCrossOriginDenial(JSContext* cx, JS::HandleId id,
+                                      const nsACString& accessType);
+};
+
+/**
+ * Returns true if the given object (which is expected to be stripped of
+ * cross-compartment wrappers in practice, but this function doesn't assume
+ * that) is a WindowProxy or Location object, which need special wrapping
+ * behavior due to being usable cross-origin in limited ways.
+ */
+bool IsCrossOriginAccessibleObject(JSObject* obj);
+
+struct Policy {
+  static bool checkCall(JSContext* cx, JS::HandleObject wrapper,
+                        const JS::CallArgs& args) {
+    MOZ_CRASH("As a rule, filtering wrappers are non-callable");
+  }
+};
+
+// This policy allows no interaction with the underlying callable. Everything
+// throws.
+struct Opaque : public Policy {
+  static bool check(JSContext* cx, JSObject* wrapper, jsid id,
+                    js::Wrapper::Action act) {
+    return false;
+  }
+  static bool deny(JSContext* cx, js::Wrapper::Action act, JS::HandleId id,
+                   bool mayThrow) {
+    return false;
+  }
+  static bool allowNativeCall(JSContext* cx, JS::IsAcceptableThis test,
+                              JS::NativeImpl impl) {
+    return false;
+  }
+};
+
+// Like the above, but allows CALL.
+struct OpaqueWithCall : public Policy {
+  static bool check(JSContext* cx, JSObject* wrapper, jsid id,
+                    js::Wrapper::Action act) {
+    return act == js::Wrapper::CALL;
+  }
+  static bool deny(JSContext* cx, js::Wrapper::Action act, JS::HandleId id,
+                   bool mayThrow) {
+    return false;
+  }
+  static bool allowNativeCall(JSContext* cx, JS::IsAcceptableThis test,
+                              JS::NativeImpl impl) {
+    return false;
+  }
+  static bool checkCall(JSContext* cx, JS::HandleObject wrapper,
+                        const JS::CallArgs& args) {
+    return AccessCheck::checkPassToPrivilegedCode(cx, wrapper, args);
+  }
+};
+
+// This class used to support permitting access to properties if they
+// appeared in an access list on the object, but now it acts like an
+// Opaque wrapper, with the exception that it fails silently for GET,
+// ENUMERATE, and GET_PROPERTY_DESCRIPTOR. This is done for backwards
+// compatibility. See bug 1397513.
+struct OpaqueWithSilentFailing : public Policy {
+  static bool check(JSContext* cx, JS::HandleObject wrapper, JS::HandleId id,
+                    js::Wrapper::Action act) {
+    return false;
+  }
+
+  static bool deny(JSContext* cx, js::Wrapper::Action act, JS::HandleId id,
+                   bool mayThrow);
+  static bool allowNativeCall(JSContext* cx, JS::IsAcceptableThis test,
+                              JS::NativeImpl impl) {
+    return false;
+  }
+};
+
+}  // namespace xpc
+
+#endif /* __AccessCheck_h__ */