Fix Java feature flag for the kid-friendly content experiment

Follow up of crrev.com/c/4920556.

Bug: b/300260872
Change-Id: I78b45fc072ec29a2a2def1131c24bce9ae178ae4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4926488
Commit-Queue: Duong Dac <ddac@chromium.org>
Reviewed-by: Alex Ilin <alexilin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1207734}
diff --git a/chrome/browser/flags/android/chrome_feature_list.cc b/chrome/browser/flags/android/chrome_feature_list.cc
index 9e916e09..531f2ca 100644
--- a/chrome/browser/flags/android/chrome_feature_list.cc
+++ b/chrome/browser/flags/android/chrome_feature_list.cc
@@ -395,6 +395,7 @@
     &send_tab_to_self::kSendTabToSelfV2,
     &share::kScreenshotsForAndroidV2,
     &supervised_user::kEnableProtoApiForClassifyUrl,
+    &supervised_user::kKidFriendlyContentFeed,
     &switches::kForceStartupSigninPromo,
     &switches::kIdentityStatusConsistency,
     &switches::kForceDisableExtendedSyncPromos,