Remove more top-level const from parameters in function declarations

This CL removes even more top-level const from parameters in function
declarations. This change is safe because top-level const in function
declarations (not function definitions) are ignored by the compiler
and so change is just a no-op cleanup.

Bug: webrtc:13610
Change-Id: Icf6868c27b1fdb9d9915b3a7020eb34bdcf07a09
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/249989
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Ali Tofigh <alito@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#35866}

modules/video_coding/codecs/test/videoprocessor.h

@@ -185,7 +185,7 @@ class VideoProcessor {
   // lower layer frames, we merge and store the layer frames in this method.
   const webrtc::EncodedImage* BuildAndStoreSuperframe(
       const EncodedImage& encoded_image,
-      const VideoCodecType codec,
+      VideoCodecType codec,
       size_t frame_number,
       size_t simulcast_svc_idx,
       bool inter_layer_predicted) RTC_RUN_ON(sequence_checker_);