Delete VideoRendererInterface.

Use in chromium was deleted a few days ago.

BUG=webrtc:5426
R=magjed@webrtc.org, pbos@webrtc.org, perkj@webrtc.org, pthatcher@webrtc.org, tkchin@webrtc.org

Review URL: https://codereview.webrtc.org/1817473002 .

Cr-Commit-Position: refs/heads/master@{#12099}
diff --git a/webrtc/examples/peerconnection/client/linux/main_wnd.h b/webrtc/examples/peerconnection/client/linux/main_wnd.h
index a7eb25e..e756fc9 100644
--- a/webrtc/examples/peerconnection/client/linux/main_wnd.h
+++ b/webrtc/examples/peerconnection/client/linux/main_wnd.h
@@ -77,9 +77,8 @@
                   webrtc::VideoTrackInterface* track_to_render);
     virtual ~VideoRenderer();
 
-    // VideoRendererInterface implementation
-    virtual void SetSize(int width, int height);
-    virtual void OnFrame(const cricket::VideoFrame& frame);
+    // VideoSinkInterface implementation
+    void OnFrame(const cricket::VideoFrame& frame) override;
 
     const uint8_t* image() const { return image_.get(); }
 
@@ -92,6 +91,7 @@
     }
 
    protected:
+    void SetSize(int width, int height);
     rtc::scoped_ptr<uint8_t[]> image_;
     int width_;
     int height_;