COIL: Migrate to HEAD

Update links to point to HEAD

BUG=b:224796805
TEST=navigate to updated link and/or N/A

Change-Id: I8b8633fcc07e42415ddc28c6e731c79e1c4f418c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/libtextclassifier/+/5158709
Commit-Queue: Andrew Moylan <[email protected]>
Tested-by: Jonathon Murphy <[email protected]>
Reviewed-by: Andrew Moylan <[email protected]>
Auto-Submit: Jonathon Murphy <[email protected]>
diff --git a/README.md b/README.md
index 449f0fe..b21299b 100644
--- a/README.md
+++ b/README.md
@@ -22,8 +22,8 @@
 into libtextclassifier's ebuild.
 
 
-[chrome-icu-ebuild-folder]: https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/refs/heads/master/chromeos-base/chrome-icu/
+[chrome-icu-ebuild-folder]: https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/HEAD/chromeos-base/chrome-icu/
 [chrome-init-icu]: https://source.chromium.org/chromium/chromium/src/+/master:base/i18n/icu_util.cc;l=234;drc=928bcad29884064f83bf05ecadf82369f8b4622f?originalUrl=https:%2F%2Fcs.chromium.org%2F
 [ml-9999-ebuild]: https://source.chromium.org/chromiumos/chromiumos/codesearch/+/master:src/third_party/chromiumos-overlay/chromeos-base/ml/ml-9999.ebuild
 [ml-service]: https://source.chromium.org/chromiumos/chromiumos/codesearch/+/master:src/platform2/ml/;l=1?q=ml%2F&sq=&ss=chromiumos
-[tclib-depend-chrome-icu]: https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/refs/heads/master/dev-libs/libtextclassifier/libtextclassifier-9999.ebuild#24
+[tclib-depend-chrome-icu]: https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/HEAD/dev-libs/libtextclassifier/libtextclassifier-9999.ebuild#24