Use audio_stream_type_t consistently

        virtual void            flush();

        virtual void            pause();

        virtual void            close();

        void setAudioStreamType(int streamType) { mStreamType = streamType; }

        void setAudioStreamType(audio_stream_type_t streamType) { mStreamType = streamType; }

                void            setVolume(float left, float right);

        virtual status_t        dump(int fd,const Vector<String16>& args) const;

        AudioTrack*             mTrack;

        AudioCallback           mCallback;

        void *                  mCallbackCookie;

        int                     mStreamType;

        audio_stream_type_t     mStreamType;

        float                   mLeftVolume;

        float                   mRightVolume;

        float                   mMsecsPerFrame;