Makes RenderFrameObserver/RenderViewObserver::OnDestruct pure virtual.

content/renderer/pepper/pepper_media_device_manager.h

 // Copyright (c) 2012 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 CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_DEVICE_MANAGER_H_
 #define CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_DEVICE_MANAGER_H_
 
 #include <map>
 
 #include "base/macros.h"
@@ skipping 63 matching lines @@
   void OnDeviceOpenFailed(int request_id) override;
   void OnDevicesChanged() override;
 
   // Stream type conversion.
   static MediaStreamType FromPepperDeviceType(PP_DeviceType_Dev type);
   static PP_DeviceType_Dev FromMediaStreamType(MediaStreamType type);
 
  private:
   explicit PepperMediaDeviceManager(RenderFrame* render_frame);
 
+  // RenderFrameObserver implementation.
+  void OnDestruct() override;
+
   // Called by StopEnumerateDevices() after returing to the event loop, to avoid
   // a reentrancy problem.
   void StopEnumerateDevicesDelayed(int request_id);
 
   void NotifyDeviceOpened(int request_id,
                           bool succeeded,
                           const std::string& label);
 
 
   MediaStreamDispatcher* GetMediaStreamDispatcher() const;
 
   int next_id_;
 
   typedef std::map<int, EnumerateDevicesCallback> EnumerateCallbackMap;
   EnumerateCallbackMap enumerate_callbacks_;
 
   typedef std::map<int, OpenDeviceCallback> OpenCallbackMap;
   OpenCallbackMap open_callbacks_;
 
   DISALLOW_COPY_AND_ASSIGN(PepperMediaDeviceManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_DEVICE_MANAGER_H_