Remove GetCurrentVideoTrackFormat dead code.

content/public/renderer/media_stream_utils.h

Index: content/public/renderer/media_stream_utils.h
diff --git a/content/public/renderer/media_stream_utils.h b/content/public/renderer/media_stream_utils.h
index c1e09376cb8a051683a5d2726729cf570885a3a5..371208440ecd9d8481e3ede65e9a06073bba3278 100644
--- a/content/public/renderer/media_stream_utils.h
+++ b/content/public/renderer/media_stream_utils.h
@@ -49,12 +49,6 @@ CONTENT_EXPORT bool AddAudioTrackToMediaStream(
     bool is_readonly,
     blink::WebMediaStream* web_media_stream);
 
-// On success returns pointer to the current format of the given video track;
-// returns nullptr on failure (if the argument is invalid or if the format
-// cannot be retrieved at the moment).
-CONTENT_EXPORT const media::VideoCaptureFormat* GetCurrentVideoTrackFormat(
-    const blink::WebMediaStreamTrack& video_track);
-
 // Requests that a refresh frame be sent "soon" (e.g., to resolve picture loss
 // or quality issues).
 CONTENT_EXPORT void RequestRefreshFrameFromVideoTrack(