Change access to removeConnection so we can override it.

Bug: 18056632
Bug: 18240234
Change-Id: I4e82051a27f3565e9a854df8b27c35300cdbe2ad

telecomm/java/android/telecom/ConnectionService.java

@@ -1039,7 +1039,8 @@ public abstract class ConnectionService extends Service {
         connection.setConnectionService(this);
     }
 
-    private void removeConnection(Connection connection) {
+    /** {@hide} */
+    protected void removeConnection(Connection connection) {
         String id = mIdByConnection.get(connection);
         connection.unsetConnectionService(this);
         connection.removeConnectionListener(mConnectionListener);