[Intl] Cleanup some code

pkg/intl/lib/date_symbols.dart

Index: pkg/intl/lib/date_symbols.dart
diff --git a/pkg/intl/lib/date_symbols.dart b/pkg/intl/lib/date_symbols.dart
index cd0b9d2fed4b97774f2847bf0eb4c39bfa5ae05e..aa76c41fd626c8bd53bcb456035c31d9429c889f 100644
--- a/pkg/intl/lib/date_symbols.dart
+++ b/pkg/intl/lib/date_symbols.dart
@@ -82,34 +82,32 @@ class DateSymbols {
     FIRSTWEEKCUTOFFDAY = map["FIRSTWEEKCUTOFFDAY"];
   }
 
-  Map serializeToMap() {
-    var map = new Map();
-    map["NAME"] = NAME;
-    map["ERAS"] = ERAS;
-    map["ERANAMES"] = ERANAMES;
-    map["NARROWMONTHS"] = NARROWMONTHS;
-    map["STANDALONENARROWMONTHS"] = STANDALONENARROWMONTHS;
-    map["MONTHS"] = MONTHS;
-    map["STANDALONEMONTHS"] = STANDALONEMONTHS;
-    map["SHORTMONTHS"] = SHORTMONTHS;
-    map["STANDALONESHORTMONTHS"] = STANDALONESHORTMONTHS;
-    map["WEEKDAYS"] = WEEKDAYS;
-    map["STANDALONEWEEKDAYS"] = STANDALONEWEEKDAYS;
-    map["SHORTWEEKDAYS"] = SHORTWEEKDAYS;
-    map["STANDALONESHORTWEEKDAYS"] = STANDALONESHORTWEEKDAYS;
-    map["NARROWWEEKDAYS"] = NARROWWEEKDAYS;
-    map["STANDALONENARROWWEEKDAYS"] = STANDALONENARROWWEEKDAYS;
-    map["SHORTQUARTERS"] = SHORTQUARTERS;
-    map["QUARTERS"] = QUARTERS;
-    map["AMPMS"] = AMPMS;
-    map["DATEFORMATS"] = DATEFORMATS;
-    map["TIMEFORMATS"] = TIMEFORMATS;
-    map["AVAILABLEFORMATS"] = AVAILABLEFORMATS;
-    map["FIRSTDAYOFWEEK"] = FIRSTDAYOFWEEK;
-    map["WEEKENDRANGE"] = WEEKENDRANGE;
-    map["FIRSTWEEKCUTOFFDAY"] = FIRSTWEEKCUTOFFDAY;
-    return map;
-  }
+  Map serializeToMap() => {
+    "NAME": NAME,
+    "ERAS": ERAS,
+    "ERANAMES": ERANAMES,
+    "NARROWMONTHS": NARROWMONTHS,
+    "STANDALONENARROWMONTHS": STANDALONENARROWMONTHS,
+    "MONTHS": MONTHS,
+    "STANDALONEMONTHS": STANDALONEMONTHS,
+    "SHORTMONTHS": SHORTMONTHS,
+    "STANDALONESHORTMONTHS": STANDALONESHORTMONTHS,
+    "WEEKDAYS": WEEKDAYS,
+    "STANDALONEWEEKDAYS": STANDALONEWEEKDAYS,
+    "SHORTWEEKDAYS": SHORTWEEKDAYS,
+    "STANDALONESHORTWEEKDAYS": STANDALONESHORTWEEKDAYS,
+    "NARROWWEEKDAYS": NARROWWEEKDAYS,
+    "STANDALONENARROWWEEKDAYS": STANDALONENARROWWEEKDAYS,
+    "SHORTQUARTERS": SHORTQUARTERS,
+    "QUARTERS": QUARTERS,
+    "AMPMS": AMPMS,
+    "DATEFORMATS": DATEFORMATS,
+    "TIMEFORMATS": TIMEFORMATS,
+    "AVAILABLEFORMATS": AVAILABLEFORMATS,
+    "FIRSTDAYOFWEEK": FIRSTDAYOFWEEK,
+    "WEEKENDRANGE": WEEKENDRANGE,
+    "FIRSTWEEKCUTOFFDAY": FIRSTWEEKCUTOFFDAY
+  };
 
   toString() => NAME;
 }
@@ -201,4 +199,4 @@ var en_USPatterns = const {
   'z': 'z', // ABBR_SPECIFIC_TZ
   'zzzz': 'zzzz', // SPECIFIC_TZ
   'ZZZZ': 'ZZZZ'  // ABBR_UTC_TZ
-};
+};