Add support for logging absl::string_view.

Bug: webrtc:8982
Change-Id: I5691f91ea663756666cf187ee223ede50f87d5f0
Reviewed-on: https://webrtc-review.googlesource.com/99840
Commit-Queue: Jonas Olsson <jonasolsson@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24707}
diff --git a/rtc_base/BUILD.gn b/rtc_base/BUILD.gn
index c780fec..a642d9e 100644
--- a/rtc_base/BUILD.gn
+++ b/rtc_base/BUILD.gn
@@ -198,6 +198,7 @@
     ":platform_thread_types",
     ":stringutils",
     ":timeutils",
+    "//third_party/abseil-cpp/absl/strings",
   ]
 
   if (build_with_chromium) {