Reland "Delete CodecNamesEq, replaced with absl::EqualsIgnoreCase"

This is a reland of 80cd25bcfb2264fa0f1192de942a6f063879dd42

Original change's description:
> Delete CodecNamesEq, replaced with absl::EqualsIgnoreCase
>
> Bug: None
> Change-Id: I225fe1e16a3c96e5a03e3ae8fe975f368be7e6ad
> Reviewed-on: https://webrtc-review.googlesource.com/c/107303
> Commit-Queue: Niels Moller <nisse@webrtc.org>
> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#25312}

Tbr: kwiberg@webrtc.org
Bug: None
Change-Id: Id43a93bada9d6d66a4d0f0286f583066156aa2fc
Reviewed-on: https://webrtc-review.googlesource.com/c/107716
Commit-Queue: Niels Moller <nisse@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25368}
diff --git a/api/video_codecs/video_codec.cc b/api/video_codecs/video_codec.cc
index ea8dfa7..0819c82 100644
--- a/api/video_codecs/video_codec.cc
+++ b/api/video_codecs/video_codec.cc
@@ -115,11 +115,6 @@
 static const char* kPayloadNameGeneric = "Generic";
 static const char* kPayloadNameMultiplex = "Multiplex";
 
-// TODO(nisse): Delete this wrapper.
-static bool CodecNamesEq(const char* name1, const char* name2) {
-  return absl::EqualsIgnoreCase(name1, name2);
-}
-
 const char* CodecTypeToPayloadString(VideoCodecType type) {
   switch (type) {
     case kVideoCodecVP8:
@@ -137,15 +132,15 @@
 }
 
 VideoCodecType PayloadStringToCodecType(const std::string& name) {
-  if (CodecNamesEq(name.c_str(), kPayloadNameVp8))
+  if (absl::EqualsIgnoreCase(name, kPayloadNameVp8))
     return kVideoCodecVP8;
-  if (CodecNamesEq(name.c_str(), kPayloadNameVp9))
+  if (absl::EqualsIgnoreCase(name, kPayloadNameVp9))
     return kVideoCodecVP9;
-  if (CodecNamesEq(name.c_str(), kPayloadNameH264))
+  if (absl::EqualsIgnoreCase(name, kPayloadNameH264))
     return kVideoCodecH264;
-  if (CodecNamesEq(name.c_str(), kPayloadNameI420))
+  if (absl::EqualsIgnoreCase(name, kPayloadNameI420))
     return kVideoCodecI420;
-  if (CodecNamesEq(name.c_str(), kPayloadNameMultiplex))
+  if (absl::EqualsIgnoreCase(name, kPayloadNameMultiplex))
     return kVideoCodecMultiplex;
   return kVideoCodecGeneric;
 }