Use enum class for VideoCodecMode and VideoCodecComplexity.

Bug: webrtc:7660
Change-Id: I6a8ef01f8abcc25c8efaf0af387408343a7c8ba3
Reviewed-on: https://webrtc-review.googlesource.com/81240
Commit-Queue: Niels Moller <nisse@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23595}
diff --git a/api/video_codecs/video_codec.h b/api/video_codecs/video_codec.h
index e8c1def..5b4ebb2 100644
--- a/api/video_codecs/video_codec.h
+++ b/api/video_codecs/video_codec.h
@@ -21,7 +21,7 @@
 // away from slowly.
 
 // Video codec
-enum VideoCodecComplexity {
+enum class VideoCodecComplexity {
   kComplexityNormal = 0,
   kComplexityHigh = 1,
   kComplexityHigher = 2,
@@ -95,7 +95,7 @@
   VideoCodecH264 H264;
 };
 
-enum VideoCodecMode { kRealtimeVideo, kScreensharing };
+enum class VideoCodecMode { kRealtimeVideo, kScreensharing };
 
 // Common video codec properties
 class VideoCodec {