Make Frame subclasses final.

third_party/WebKit/Source/core/frame/RemoteFrame.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 RemoteFrame_h
 #define RemoteFrame_h
 
 #include "core/CoreExport.h"
 #include "core/dom/RemoteSecurityContext.h"
 #include "core/frame/Frame.h"
 #include "public/platform/WebFocusType.h"
 
 namespace blink {
 
 class Event;
 class IntRect;
 class LocalFrame;
 class RemoteDOMWindow;
 class RemoteFrameClient;
 class RemoteFrameView;
 class WebLayer;
 class WindowProxyManager;
 struct FrameLoadRequest;
 
-class CORE_EXPORT RemoteFrame: public Frame {
+class CORE_EXPORT RemoteFrame final : public Frame {
 public:
     static RemoteFrame* create(RemoteFrameClient*, FrameHost*, FrameOwner*);
 
     ~RemoteFrame() override;
 
     // Frame overrides:
     DECLARE_VIRTUAL_TRACE();
     DOMWindow* domWindow() const override;
     WindowProxy* windowProxy(DOMWrapperWorld&) override;
     void navigate(Document& originDocument, const KURL&, bool replaceCurrentItem, UserGestureStatus) override;
@@ skipping 45 matching lines @@
 inline RemoteFrameView* RemoteFrame::view() const
 {
     return m_view.get();
 }
 
 DEFINE_TYPE_CASTS(RemoteFrame, Frame, remoteFrame, remoteFrame->isRemoteFrame(), remoteFrame.isRemoteFrame());
 
 } // namespace blink
 
 #endif // RemoteFrame_h