RefCounted types should not have public destructors, media/ and gpu/ edition

media/filters/audio_renderer_impl_unittest.cc

Index: media/filters/audio_renderer_impl_unittest.cc
diff --git a/media/filters/audio_renderer_impl_unittest.cc b/media/filters/audio_renderer_impl_unittest.cc
index 862b734d9e86d94d73da5257ebdc7936bc2450f0..7470a1ec8626b607bd31bfe507c8ee2f036bc1f4 100644
--- a/media/filters/audio_renderer_impl_unittest.cc
+++ b/media/filters/audio_renderer_impl_unittest.cc
@@ -32,6 +32,9 @@ class MockAudioSink : public media::AudioRendererSink {
   MOCK_METHOD1(SetPlaybackRate, void(float rate));
   MOCK_METHOD1(SetVolume, bool(double volume));
   MOCK_METHOD1(GetVolume, void(double* volume));
+
+ protected:
+  virtual ~MockAudioSink() {}
 };
 
 }  // namespace