Add absl::Cleanup to absl component

So that it may be used in third party code.

Bug: None
Change-Id: Ice36788f8e61fc8c2b8abcc3e9c300c1e5e5ef4e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3465535
Auto-Submit: Danil Chapovalov <danilchap@chromium.org>
Reviewed-by: Mirko Bonadei <mbonadei@chromium.org>
Commit-Queue: Mirko Bonadei <mbonadei@chromium.org>
Cr-Commit-Position: refs/heads/main@{#971708}
NOKEYCHECK=True
GitOrigin-RevId: 4334b6893201df725e281fdd9ed0d68ce664300e
diff --git a/BUILD.gn b/BUILD.gn
index fa7a3e9..63a72af 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -61,6 +61,7 @@
     "//third_party/abseil-cpp/absl/base",
     "//third_party/abseil-cpp/absl/base:config",
     "//third_party/abseil-cpp/absl/base:core_headers",
+    "//third_party/abseil-cpp/absl/cleanup",
     "//third_party/abseil-cpp/absl/container:btree",
     "//third_party/abseil-cpp/absl/container:fixed_array",
     "//third_party/abseil-cpp/absl/container:flat_hash_map",