Make SecurityContext available in RemoteFrames.

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>);
+
+private:
+    RemoteSecurityContext();
+};
+
+} // namespace blink
+
+#endif // RemoteSecurityContext_h