Delete variant of rtc::split that copies the output fields

Bug: webrtc:13579
Change-Id: I065a32704d48d5eed21aee0e9757cac9ecf7aa99
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/261951
Reviewed-by: Alessio Bazzica <alessiob@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Reviewed-by: Ali Tofigh <alito@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#37160}

api/crypto_params.h

@@ -13,6 +13,8 @@
 
 #include <string>
 
+#include "absl/strings/string_view.h"
+
 namespace cricket {
 
 // Parameters for SRTP negotiation, as described in RFC 4568.
@@ -21,9 +23,9 @@ namespace cricket {
 struct CryptoParams {
   CryptoParams() : tag(0) {}
   CryptoParams(int t,
-               const std::string& cs,
-               const std::string& kp,
-               const std::string& sp)
+               absl::string_view cs,
+               absl::string_view kp,
+               absl::string_view sp)
       : tag(t), cipher_suite(cs), key_params(kp), session_params(sp) {}
 
   bool Matches(const CryptoParams& params) const {