Fix all -Wnon-virtual-dtor warnings.

webrtc/media/base/codec.h

Index: webrtc/media/base/codec.h
diff --git a/webrtc/media/base/codec.h b/webrtc/media/base/codec.h
index c16158ffb2bdb105ec5ef52a2146d7f9a3e22d79..76a623a0de8af540da8eeb777c18437ad9fdd352 100644
--- a/webrtc/media/base/codec.h
+++ b/webrtc/media/base/codec.h
@@ -73,7 +73,7 @@ struct Codec {
   // Creates an empty codec.
   Codec();
   Codec(const Codec& c);
-  ~Codec();
+  virtual ~Codec();

[nisse-webrtc, 2016/05/02 07:00:36]

Seems a bit odd to have virtual methods on something declared as a struct. But
not a problem in this cl.

 
   // Indicates if this codec is compatible with the specified codec.
   bool Matches(const Codec& codec) const;
@@ -120,7 +120,7 @@ struct AudioCodec : public Codec {
   // Creates an empty codec.
   AudioCodec();
   AudioCodec(const AudioCodec& c);
-  ~AudioCodec() = default;
+  virtual ~AudioCodec() = default;
 
   // Indicates if this codec is compatible with the specified codec.
   bool Matches(const AudioCodec& codec) const;
@@ -153,7 +153,7 @@ struct VideoCodec : public Codec {
   // Creates an empty codec.
   VideoCodec();
   VideoCodec(const VideoCodec& c);
-  ~VideoCodec() = default;
+  virtual ~VideoCodec() = default;
 
   std::string ToString() const;
 
@@ -186,6 +186,7 @@ struct DataCodec : public Codec {
   DataCodec(int id, const std::string& name);
   DataCodec();
   DataCodec(const DataCodec& c);
+  virtual ~DataCodec() = default;
 
   DataCodec& operator=(const DataCodec& c);