Make DOMWindowProperty a thin wrapper of ContextLifecycleObserver

third_party/WebKit/Source/modules/presentation/PresentationController.h

 // Copyright 2015 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 PresentationController_h
 #define PresentationController_h
 
 #include "core/frame/DOMWindowProperty.h"
 #include "core/frame/LocalFrame.h"
 #include "modules/ModulesExport.h"
@@ skipping 59 matching lines @@
   // url.
   void setDefaultRequestUrl(const KURL&);
 
   // Handling of running connections.
   void registerConnection(PresentationConnection*);
 
  private:
   PresentationController(LocalFrame&, WebPresentationClient*);
 
   // Implementation of DOMWindowProperty.
-  void frameDestroyed() override;
+  void contextDestroyed() override;
 
   // Return the connection associated with the given |connectionClient| or
   // null if it doesn't exist.
   PresentationConnection* findConnection(WebPresentationConnectionClient*);
 
   // The WebPresentationClient which allows communicating with the embedder.
   // It is not owned by the PresentationController but the controller will
   // set it to null when the LocalFrame will be detached at which point the
   // client can't be used.
   WebPresentationClient* m_client;
 
   // Default PresentationRequest used by the embedder.
   // Member<PresentationRequest> m_defaultRequest;
   WeakMember<Presentation> m_presentation;
 
   // The presentation connections associated with that frame.
   // TODO(mlamouri): the PresentationController will keep any created
   // connections alive until the frame is detached. These should be weak ptr
   // so that the connection can be GC'd.
   HeapHashSet<Member<PresentationConnection>> m_connections;
 };
 
 }  // namespace blink
 
 #endif  // PresentationController_h