anchor.diff:  @Injectable()
   class AppViewUtils {
     final String _appId;
  -  EventManager eventManager;
  +  final EventManager eventManager;
  +  final SanitizationService sanitizer;
     static int _nextCompTypeId = 0;
   
     /// Whether change detection should throw an exception when a change is
  
positive.code:   /// stable.
    static void enterThrowOnChanges() {
      _throwOnChangesCounter++;
      throwOnChanges = true;
    }
  
    /// Exits change detection check mode.
  
negative.code:   /// stable.
    static void exitThrowOnChanges() {
      _throwOnChangesCounter--;
      _throwOnChanges = _throwOnChangesCounter != 0;
    }
  
    /// Used in tests that cause exceptions on purpose.
    static void resetChangeDetection() {
      _throwOnChangesCounter = 0;
      _throwOnChanges = false;
    }
  }
  
  