Minor cleanups to take advantage of lazy initialization

pkg/intl/lib/src/lazy_locale_data.dart

Index: pkg/intl/lib/src/lazy_locale_data.dart
===================================================================
--- pkg/intl/lib/src/lazy_locale_data.dart	(revision 13132)
+++ pkg/intl/lib/src/lazy_locale_data.dart	(working copy)
@@ -42,7 +42,7 @@
   /**
    * The set of available locales.
    */
-  Set _availableLocaleSet;
+  Set availableLocaleSet;
 
   /**
    * The constructor. The [uriString] specifies where the data comes
@@ -54,16 +54,9 @@
   LazyLocaleData(this._reader, this._creationFunction, List keys) {
     map = new Map();
     availableLocales = keys;
+    availableLocaleSet = new Set.from(availableLocales);
   }
 
-  /** The set of available locales. */
-  get availableLocaleSet {
-    if (_availableLocaleSet == null) {
-      _availableLocaleSet = new Set.from(availableLocales);
-    }
-    return _availableLocaleSet;
-  }
-
   /**
    *  Tests if we have data for the locale available. Note that this returns
    * true even if the data is known to be available remotely but not yet loaded.