Get rid of a lot of () for getters.

lib/coreimpl/duration_implementation.dart

 // Copyright (c) 2011, 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.
 
 // Dart core library.
 
 class DurationImplementation implements Duration {
   final int inMilliseconds;
 
   const DurationImplementation([int days = 0,
                                 int hours = 0,
                                 int minutes = 0,
                                 int seconds = 0,
                                 int milliseconds = 0])
     : inMilliseconds = days * Duration.MILLISECONDS_PER_DAY +
                        hours * Duration.MILLISECONDS_PER_HOUR +
                        minutes * Duration.MILLISECONDS_PER_MINUTE +
                        seconds * Duration.MILLISECONDS_PER_SECOND +
                        milliseconds;
 
-  int get inDays() {
+  int get inDays {
     return inMilliseconds ~/ Duration.MILLISECONDS_PER_DAY;
   }
 
-  int get inHours() {
+  int get inHours {
     return inMilliseconds ~/ Duration.MILLISECONDS_PER_HOUR;
   }
 
-  int get inMinutes() {
+  int get inMinutes {
     return inMilliseconds ~/ Duration.MILLISECONDS_PER_MINUTE;
   }
 
-  int get inSeconds() {
+  int get inSeconds {
     return inMilliseconds ~/ Duration.MILLISECONDS_PER_SECOND;
   }
 
   bool operator ==(other) {
     if (other is !Duration) return false;
     return inMilliseconds == other.inMilliseconds;
   }
 
   int hashCode() {
     return inMilliseconds.hashCode();
@@ skipping 21 matching lines @@
     }
     String twoDigitMinutes =
         twoDigits(inMinutes.remainder(Duration.MINUTES_PER_HOUR));
     String twoDigitSeconds =
         twoDigits(inSeconds.remainder(Duration.SECONDS_PER_MINUTE));
     String threeDigitMs =
         threeDigits(inMilliseconds.remainder(Duration.MILLISECONDS_PER_SECOND));
     return "${inHours}:${twoDigitMinutes}:${twoDigitSeconds}.${threeDigitMs}";
   }
 }