Fix a comment in FrameDropper

Bug: webrtc:12810
Change-Id: I340b1c84785070b3b12490aa873ca17aab2e423a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/225100
Reviewed-by: Åsa Persson <asapersson@webrtc.org>
Commit-Queue: Sergey Silkin <ssilkin@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34421}
diff --git a/modules/video_coding/utility/frame_dropper.h b/modules/video_coding/utility/frame_dropper.h
index 50a8d58..014b5dd 100644
--- a/modules/video_coding/utility/frame_dropper.h
+++ b/modules/video_coding/utility/frame_dropper.h
@@ -44,7 +44,7 @@
   // Input:
   //          - framesize_bytes    : The size of the latest frame returned
   //                                 from the encoder.
-  //          - delta_frame        : True if the encoder returned a key frame.
+  //          - delta_frame        : True if the encoder returned a delta frame.
   void Fill(size_t framesize_bytes, bool delta_frame);
 
   void Leak(uint32_t input_framerate);