Clean up handling of NetworkCapabilities#administratorUids.

Update ConnectivityService's check for administrator UIDs to use
ArrayUtils to check for UID inclusion. Update the NetworkCapabilities
annotation on the administrator UIDs field to clarify that it is
NonNull.

Bug: 147903575
Test: atest FrameworksNetTests
Change-Id: Id630fe9d76aacdaf038fdaa5360f0327520ee0c3
diff --git a/core/java/android/net/NetworkCapabilities.java b/core/java/android/net/NetworkCapabilities.java
index ae5c24e..bf8ba65 100644
--- a/core/java/android/net/NetworkCapabilities.java
+++ b/core/java/android/net/NetworkCapabilities.java
@@ -882,7 +882,7 @@
      * empty unless the destination is 1) the System Server, or 2) Telephony. In either case, the
      * receiving entity must have the ACCESS_FINE_LOCATION permission and target R+.
      */
-    private int[] mAdministratorUids = new int[0];
+    @NonNull private int[] mAdministratorUids = new int[0];
 
     /**
      * Sets the int[] of UIDs that are administrators of this network.
diff --git a/services/core/java/com/android/server/ConnectivityService.java b/services/core/java/com/android/server/ConnectivityService.java
index 1ec4bc3..42fa099 100644
--- a/services/core/java/com/android/server/ConnectivityService.java
+++ b/services/core/java/com/android/server/ConnectivityService.java
@@ -7953,11 +7953,7 @@
 
         // Administrator UIDs also contains the Owner UID
         final int[] administratorUids = nai.networkCapabilities.getAdministratorUids();
-        for (final int uid : administratorUids) {
-            if (uid == callbackUid) return true;
-        }
-
-        return false;
+        return ArrayUtils.contains(administratorUids, callbackUid);
     }
 
     @Override