Avoid inconsistent state when remove fails.

Bug: 5433432
Change-Id: Ia388fda006cbda09b5947fc61cec6353f75a3805

Author: jsharkey

services/java/com/android/server/NetworkManagementService.java

@@ -1136,12 +1136,14 @@ public void removeInterfaceQuota(String iface) {
             final StringBuilder command = new StringBuilder();
             command.append("bandwidth removeiquota ").append(iface);
 
+            mActiveQuotaIfaces.remove(iface);
+            mActiveAlertIfaces.remove(iface);
+
             try {
                 // TODO: support quota shared across interfaces
                 mConnector.doCommand(command.toString());
-                mActiveQuotaIfaces.remove(iface);
-                mActiveAlertIfaces.remove(iface);
             } catch (NativeDaemonConnectorException e) {
+                // TODO: include current iptables state
                 throw new IllegalStateException("Error communicating to native daemon", e);
             }
         }