[ssci] Add Shipped field to READMEs

This CL adds the Shipped field and updates the
License File field in Chromium READMEs within the
directory /third_party/re2.

See the LSC doc at go/lsc-chrome-metadata.

This CL was uploaded by git cl split.

R=thakis@chromium.org

Bug: b:285450740
Change-Id: I8c4e69254c089b7cdf7085d9431134a2fbf0b2e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4663816
Auto-Submit: Anne Redulla <aredulla@google.com>
Reviewed-by: Rick Byers <rbyers@chromium.org>
Commit-Queue: Rick Byers <rbyers@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1171155}
NOKEYCHECK=True
GitOrigin-RevId: b3270406ebd6dc038371dceffd804885a89bb665
diff --git a/README.chromium b/README.chromium
index a44d07b..77c90c2 100644
--- a/README.chromium
+++ b/README.chromium
@@ -6,6 +6,7 @@
 License: BSD 3-Clause
 License File: LICENSE
 Security Critical: yes
+Shipped: yes
 
 Description:
 RE2 is a fast, safe, thread-friendly alternative to backtracking regular