Workaround for IllegalArgumentException in SyncManager

* There is a race condition in which the AccountManager listener
  isn't properly unregistered when SyncManager is shut down
* In this case, SyncManager tries to register a new listener
  (i.e. registering again), which causes an IllegalArgumentException
* The quick workaround is simply to catch and ignore this exception,
  as it's really more of a warning than a true error
* A bug will be filed for the underlying issue

Bug: 2631561
Change-Id: I139d24ae045d402d4d8cb006406ef96ccc768566

src/com/android/exchange/SyncManager.java

@@ -1811,8 +1811,14 @@ public class SyncManager extends Service implements Runnable {
         ContentResolver.addStatusChangeListener(ContentResolver.SYNC_OBSERVER_TYPE_SETTINGS,
                 mSyncStatusObserver);
         mAccountsUpdatedListener = new EasAccountsUpdatedListener();
-        AccountManager.get(getApplication())
-            .addOnAccountsUpdatedListener(mAccountsUpdatedListener, mHandler, true);
+        // TODO Find and fix root cause of duplication
+        try {
+            AccountManager.get(getApplication())
+                .addOnAccountsUpdatedListener(mAccountsUpdatedListener, mHandler, true);
+        } catch (IllegalStateException e1) {
+            // This exception is more of a warning; we shouldn't be in the state in which we
+            // already have a listener.
+        }
 
         // Set up receivers for ConnectivityManager
         mConnectivityReceiver = new ConnectivityReceiver();