Update remaining usages of Completer.completeException.

samples/dartcombat/state.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dartcombatlib;
 
 void spawnPlayer() {
   PlayerState state = new PlayerState();
   port.receive(state.dispatch);
 }
@@ skipping 221 matching lines @@
           case Constants.SUNK:
             sunk.complete(true);
             break;
           case Constants.MISS:
             sunk.complete(false);
             break;
         }
       });
       shot.handleException((String error) {
         _recordFailedShot(x, y);
-        sunk.completeException(error);
+        sunk.completeError(error);
         return true;
       });
       // We don't actually chain sunk.cancel with shot.cancel because individual
       // shots can't be cancelled.
     } else {
       sunk.complete(false);
     }
   }
 
   /** checks that a shot is in range and has not been done before. */
@@ skipping 43 matching lines @@
       case Constants.SUNK:
         totalHits++;
         boatsSunk++;
         _enemyView.addHit(x, y);
         enemyGrid.hit(x, y);
         break;
     }
     _enemyView.statusBar.updateStatus();
   }
 }