Delete the VideoCodec::plName string.

It holds the same information as codecType, but in different format.

Bug: webrtc:8830
Change-Id: Ia83e2dff4fd9a5ddb489501b7a1fe80759fa4218
Reviewed-on: https://webrtc-review.googlesource.com/56100
Reviewed-by: Erik Språng <sprang@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22307}

modules/video_coding/codecs/vp8/simulcast_test_utility.h

@@ -192,7 +192,6 @@ class TestVp8Simulcast : public ::testing::Test {
                               const int* temporal_layer_profile) {
     RTC_CHECK(settings);
     memset(settings, 0, sizeof(VideoCodec));
-    strncpy(settings->plName, "VP8", 4);
     settings->codecType = kVideoCodecVP8;
     // 96 to 127 dynamic payload types for video codecs
     settings->plType = 120;