Adopt absl::string_view in call/

Bug: webrtc:13579
Change-Id: Ib616eb3372da341fafb55c23038182751b9da5a2
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/262780
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Ali Tofigh <alito@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#36910}
diff --git a/call/bitrate_allocator_unittest.cc b/call/bitrate_allocator_unittest.cc
index e4f0566..69bdd83 100644
--- a/call/bitrate_allocator_unittest.cc
+++ b/call/bitrate_allocator_unittest.cc
@@ -14,6 +14,7 @@
 #include <memory>
 #include <vector>
 
+#include "absl/strings/string_view.h"
 #include "system_wrappers/include/clock.h"
 #include "test/gmock.h"
 #include "test/gtest.h"
@@ -306,7 +307,7 @@
                    uint32_t max_bitrate_bps,
                    uint32_t pad_up_bitrate_bps,
                    bool enforce_min_bitrate,
-                   std::string track_id,
+                   absl::string_view track_id,
                    double bitrate_priority) {
     allocator_->AddObserver(
         observer, {min_bitrate_bps, max_bitrate_bps, pad_up_bitrate_bps, 0,