RefCounted types should not have public destructors, delegate cleanup

media/filters/ffmpeg_glue.h

Index: media/filters/ffmpeg_glue.h
diff --git a/media/filters/ffmpeg_glue.h b/media/filters/ffmpeg_glue.h
index 4e122a6ef550e0498a3fd0e9f4ab3494f6123003..c5aa15c2ad8220dc0e3dfd2a3fcfda9b3ae70edc 100644
--- a/media/filters/ffmpeg_glue.h
+++ b/media/filters/ffmpeg_glue.h
@@ -41,8 +41,6 @@ class MEDIA_EXPORT FFmpegURLProtocol {
  public:
   FFmpegURLProtocol() {}
 
-  virtual ~FFmpegURLProtocol() {}
-
   // Read the given amount of bytes into data, returns the number of bytes read
   // if successful, kReadError otherwise.
   virtual size_t Read(size_t size, uint8* data) = 0;
@@ -61,6 +59,9 @@ class MEDIA_EXPORT FFmpegURLProtocol {
   // Returns false if this protocol supports random seeking.
   virtual bool IsStreaming() = 0;
 
+ protected:
+  virtual ~FFmpegURLProtocol() {}
+
  private:
   DISALLOW_COPY_AND_ASSIGN(FFmpegURLProtocol);
 };