Prepare to replicate sandbox flags for OOPIF

Source/core/dom/RemoteSecurityContext.h

 // 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.
 
 #ifndef RemoteSecurityContext_h
 #define RemoteSecurityContext_h
 
 #include "core/dom/SecurityContext.h"
 
 namespace blink {
 
 class RemoteSecurityContext : public SecurityContext, public RefCounted<RemoteSecurityContext> {
 public:
     static PassRefPtr<RemoteSecurityContext> create();
     void setReplicatedOrigin(PassRefPtr<SecurityOrigin>);
 
+    // FIXME: implement
+    void didUpdateSecurityOrigin() override { }
+
 private:
     RemoteSecurityContext();
 };
 
 } // namespace blink
 
 #endif // RemoteSecurityContext_h