Fix cannot find removeUnwantedCapability on R device

Test: atest CtsNetTestCasesLatestSdk:android.net.NetworkCapabilitiesTest
Fix: 183473863
Merged-In: Icf2cda325795acee22a6c634e8d978f64c5ac3cb
Change-Id: Icf2cda325795acee22a6c634e8d978f64c5ac3cb
  (cherry-picked from ag/13966708)
diff --git a/tests/net/common/java/android/net/NetworkCapabilitiesTest.java b/tests/net/common/java/android/net/NetworkCapabilitiesTest.java
index f161e52..03e4d66 100644
--- a/tests/net/common/java/android/net/NetworkCapabilitiesTest.java
+++ b/tests/net/common/java/android/net/NetworkCapabilitiesTest.java
@@ -611,17 +611,18 @@
             // From S, it is not allowed to have the same capability in both wanted and
             // unwanted list.
             assertThrows(IllegalArgumentException.class, () -> nc2.combineCapabilities(nc1));
+            // Remove unwanted capability to continue other tests.
+            nc1.removeUnwantedCapability(NET_CAPABILITY_NOT_ROAMING);
         } else {
             nc2.combineCapabilities(nc1);
             // We will get this capability in both requested and unwanted lists thus this request
             // will never be satisfied.
             assertTrue(nc2.hasCapability(NET_CAPABILITY_NOT_ROAMING));
             assertTrue(nc2.hasUnwantedCapability(NET_CAPABILITY_NOT_ROAMING));
+            // For R or below, remove unwanted capability via removeCapability.
+            nc1.removeCapability(NET_CAPABILITY_NOT_ROAMING);
         }
 
-        // Remove unwanted capability to continue other tests.
-        nc1.removeUnwantedCapability(NET_CAPABILITY_NOT_ROAMING);
-
         nc1.setSSID(TEST_SSID);
         nc2.combineCapabilities(nc1);
         if (isAtLeastR()) {