Devirtualize destructors for several mediastream platform classes

Source/core/platform/mediastream/MediaStreamDescriptor.h

 /*
  * Copyright (C) 2011 Ericsson AB. All rights reserved.
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 42 matching lines @@
 public:
     class ExtraData : public RefCounted<ExtraData> {
     public:
         virtual ~ExtraData() { }
     };
 
     static PassRefPtr<MediaStreamDescriptor> create(const MediaStreamSourceVector& audioSources, const MediaStreamSourceVector& videoSources);
 
     static PassRefPtr<MediaStreamDescriptor> create(const String& id, const MediaStreamComponentVector& audioComponents, const MediaStreamComponentVector& videoComponents);
 
-    virtual ~MediaStreamDescriptor();
+    ~MediaStreamDescriptor();
 
     MediaStreamDescriptorClient* client() const { return m_client; }
     void setClient(MediaStreamDescriptorClient* client) { m_client = client; }
 
     String id() const { return m_id; }
 
     unsigned numberOfAudioComponents() const { return m_audioComponents.size(); }
     MediaStreamComponent* audioComponent(unsigned index) const { return m_audioComponents[index].get(); }
 
     unsigned numberOfVideoComponents() const { return m_videoComponents.size(); }
@@ skipping 22 matching lines @@
     bool m_ended;
 
     RefPtr<ExtraData> m_extraData;
 };
 
 typedef Vector<RefPtr<MediaStreamDescriptor> > MediaStreamDescriptorVector;
 
 } // namespace WebCore
 
 #endif // MediaStreamDescriptor_h