Get rid of a lot of () for getters.

lib/html/src/Device.dart

Index: lib/html/src/Device.dart
diff --git a/lib/html/src/Device.dart b/lib/html/src/Device.dart
index 3dc6649fe9b6cf6fc4ce80e1e75d84e2f21a4846..ecfc86008e4609791b2d1ec6bf5a7fa2a6361425 100644
--- a/lib/html/src/Device.dart
+++ b/lib/html/src/Device.dart
@@ -11,20 +11,20 @@ class _Device {
    * the user agent.
    * Returns the user agent.
    */
-  static String get userAgent() => window.navigator.userAgent;
+  static String get userAgent => window.navigator.userAgent;
 
   /**
    * Determines if the current device is running Opera.
    */
-  static bool get isOpera() => userAgent.contains("Opera", 0);
+  static bool get isOpera => userAgent.contains("Opera", 0);
 
   /**
    * Determines if the current device is running Internet Explorer.
    */
-  static bool get isIE() => !isOpera && userAgent.contains("MSIE", 0);
+  static bool get isIE => !isOpera && userAgent.contains("MSIE", 0);
 
   /**
    * Determines if the current device is running Firefox.
    */
-  static bool get isFirefox() => userAgent.contains("Firefox", 0);
+  static bool get isFirefox => userAgent.contains("Firefox", 0);
 }