Mark a few build-time-only third-party README.chromiums as NOT_SHIPPED

To avoid them being listed in about:credits

BUG=332521

Review-Url: https://codereview.chromium.org/1935233002
Cr-Commit-Position: refs/heads/master@{#391285}
GitOrigin-RevId: c11f4b9a2e07b096d77ad038d42b83d9203eb0bf
diff --git a/README.chromium b/README.chromium
index 8f6bb02..0d19b31 100644
--- a/README.chromium
+++ b/README.chromium
@@ -2,7 +2,7 @@
 URL: https://github.com/google/bazel/tree/master/third_party/ijar
 Version: 0
 Revision: 31c8878fa3ed34356d90642c19e46e4a06d84f4a
-License: Apache 2.0
+License: NOT_SHIPPED
 Security Critical: No
 
 Description: