Use the non-API static UserHandle.getUid method in tests.

The code was updated in AOSP to use the new non-static
UserHandle#getUid(int), which is only available in S or above.
This fails to build in mainline-prod. Instead of defining a shim
for this, simply use an older method that takes a userId.

Bug: 165835257
Test: atest CtsNetTestCases:android.net.cts.ConnectivityManagerTest
Test: CtsNetTestCasesLatestSdk:android.net.cts.ConnectivityManagerTest
Change-Id: Id529f8b201cc871aa3155aef0f44574d88040c2d
diff --git a/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java b/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java
index 18617e8..90bdb5e 100644
--- a/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java
+++ b/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java
@@ -1823,7 +1823,7 @@
         final DetailedBlockedStatusCallback otherUidCallback = new DetailedBlockedStatusCallback();
 
         final int myUid = Process.myUid();
-        final int otherUid = UserHandle.of(5).getUid(Process.FIRST_APPLICATION_UID);
+        final int otherUid = UserHandle.getUid(5, Process.FIRST_APPLICATION_UID);
         final Handler handler = new Handler(Looper.getMainLooper());
         mCm.registerDefaultNetworkCallback(myUidCallback, handler);
         mCmShim.registerDefaultNetworkCallbackAsUid(otherUid, otherUidCallback, handler);