Use new LiRequestIdrFrame() API

app/streaming/session.h

@@ -45,8 +45,6 @@ public:
 
     void flushWindowEvents();
 
-    bool getAndClearPendingIdrFrameStatus();
-
 signals:
     void stageStarting(QString stage);
 
@@ -156,7 +154,6 @@ private:
     SDL_Window* m_Window;
     IVideoDecoder* m_VideoDecoder;
     SDL_SpinLock m_DecoderLock;
-    SDL_atomic_t m_NeedsIdr;
     bool m_AudioDisabled;
     bool m_AudioMuted;
     Uint32 m_FullScreenFlag;