Adopt absl::string_view in CopyOnWriteBuffer

Bug: webrtc:13579
Change-Id: Ia2b99a28ed0c103215e8616da67a5c961b957199
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/260465
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Ali Tofigh <alito@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#36832}
diff --git a/rtc_base/BUILD.gn b/rtc_base/BUILD.gn
index b4cf481..33cd57f 100644
--- a/rtc_base/BUILD.gn
+++ b/rtc_base/BUILD.gn
@@ -183,6 +183,7 @@
     "../api:scoped_refptr",
     "system:rtc_export",
   ]
+  absl_deps = [ "//third_party/abseil-cpp/absl/strings" ]
 }
 
 rtc_library("event_tracer") {