Revert "Fix a ton of compiler warnings."

chrome/renderer/audio_message_filter.h

Index: chrome/renderer/audio_message_filter.h
diff --git a/chrome/renderer/audio_message_filter.h b/chrome/renderer/audio_message_filter.h
index 3052330bdb1adfc025ccff2704e2b57f0bce1cf5..04ff69989c9f615998bd65264fb4fa8bd3912bd7 100644
--- a/chrome/renderer/audio_message_filter.h
+++ b/chrome/renderer/audio_message_filter.h
@@ -32,9 +32,6 @@ class AudioMessageFilter : public IPC::ChannelProxy::MessageFilter {
     // Called when notification of stream volume is received from the browser
     // process.
     virtual void OnVolume(double left, double right) = 0;
-
-   protected:
-    ~Delegate() {}
   };
 
   AudioMessageFilter(int32 route_id);