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/modules/video_coding/BUILD.gn b/modules/video_coding/BUILD.gn
index f09c91f..27f7f3d 100644
--- a/modules/video_coding/BUILD.gn
+++ b/modules/video_coding/BUILD.gn
@@ -306,6 +306,7 @@
     "../../rtc_base/system:rtc_export",
     "../../system_wrappers:metrics",
     "//third_party/abseil-cpp/absl/memory",
+    "//third_party/abseil-cpp/absl/strings",
     "//third_party/libyuv",
   ]
 
diff --git a/modules/video_coding/codecs/h264/h264_encoder_impl.cc b/modules/video_coding/codecs/h264/h264_encoder_impl.cc
index 00e8f7e..85082b8 100644
--- a/modules/video_coding/codecs/h264/h264_encoder_impl.cc
+++ b/modules/video_coding/codecs/h264/h264_encoder_impl.cc
@@ -19,6 +19,7 @@
 #include "third_party/openh264/src/codec/api/svc/codec_def.h"
 #include "third_party/openh264/src/codec/api/svc/codec_ver.h"
 
+#include "absl/strings/match.h"
 #include "common_video/libyuv/include/webrtc_libyuv.h"
 #include "modules/video_coding/utility/simulcast_rate_allocator.h"
 #include "modules/video_coding/utility/simulcast_utility.h"
@@ -167,7 +168,7 @@
       encoded_image_callback_(nullptr),
       has_reported_init_(false),
       has_reported_error_(false) {
-  RTC_CHECK(cricket::CodecNamesEq(codec.name, cricket::kH264CodecName));
+  RTC_CHECK(absl::EqualsIgnoreCase(codec.name, cricket::kH264CodecName));
   std::string packetization_mode_string;
   if (codec.GetParam(cricket::kH264FmtpPacketizationMode,
                      &packetization_mode_string) &&