Remove per-user preference when the user is removed

Test: new test for this
Change-Id: I335e82e29ec8f4c8da9def8b40153858cfd5bacb
diff --git a/services/core/java/com/android/server/ConnectivityService.java b/services/core/java/com/android/server/ConnectivityService.java
index 8422866..dfb4349 100644
--- a/services/core/java/com/android/server/ConnectivityService.java
+++ b/services/core/java/com/android/server/ConnectivityService.java
@@ -5124,6 +5124,9 @@
 
     private void onUserRemoved(UserHandle user) {
         mPermissionMonitor.onUserRemoved(user);
+        // If there was a network preference for this user, remove it.
+        handleSetProfileNetworkPreference(new ProfileNetworkPreferences.Preference(user, null),
+                null /* listener */);
         if (mOemNetworkPreferences.getNetworkPreferences().size() > 0) {
             handleSetOemNetworkPreference(mOemNetworkPreferences, null);
         }
@@ -9237,7 +9240,9 @@
         // touched on the handler thread, it's theoretically not impossible that it has changed
         // since.
         if (!mOemNetworkPreferences.isEmpty()) {
-            logwtf("handleSetProfileNetworkPreference, but OEM network preferences not empty");
+            // This may happen on a device with an OEM preference set when a user is removed.
+            // In this case, it's safe to ignore. In particular this happens in the tests.
+            loge("handleSetProfileNetworkPreference, but OEM network preferences not empty");
             return;
         }
 
diff --git a/tests/net/java/com/android/server/ConnectivityServiceTest.java b/tests/net/java/com/android/server/ConnectivityServiceTest.java
index 6f31c12..a63e2d2 100644
--- a/tests/net/java/com/android/server/ConnectivityServiceTest.java
+++ b/tests/net/java/com/android/server/ConnectivityServiceTest.java
@@ -11488,6 +11488,31 @@
         // Other callbacks will be unregistered by tearDown()
     }
 
+    @Test
+    public void testProfilePreferenceRemovedUponUserRemoved() throws Exception {
+        final InOrder inOrder = inOrder(mMockNetd);
+        final UserHandle testHandle = setupEnterpriseNetwork();
+
+        mCellNetworkAgent = new TestNetworkAgentWrapper(TRANSPORT_CELLULAR);
+        mCellNetworkAgent.connect(true);
+
+        final TestOnCompleteListener listener = new TestOnCompleteListener();
+        mCm.setProfileNetworkPreference(testHandle, PROFILE_NETWORK_PREFERENCE_ENTERPRISE,
+                r -> r.run(), listener);
+        listener.expectOnComplete();
+        inOrder.verify(mMockNetd).networkCreatePhysical(mCellNetworkAgent.getNetwork().netId,
+                INetd.PERMISSION_NONE);
+        inOrder.verify(mMockNetd).networkAddUidRanges(mCellNetworkAgent.getNetwork().netId,
+                uidRangeFor(testHandle));
+
+        final Intent removedIntent = new Intent(ACTION_USER_REMOVED);
+        removedIntent.putExtra(Intent.EXTRA_USER, testHandle);
+        processBroadcast(removedIntent);
+
+        inOrder.verify(mMockNetd).networkRemoveUidRanges(mCellNetworkAgent.getNetwork().netId,
+                uidRangeFor(testHandle));
+    }
+
     /**
      * Make sure that OEM preference and per-profile preference can't be used at the same
      * time and throw ISE if tried