Format all tests.

tests/language/import_core_test.dart

 // Copyright (c) 2012, 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.
 // Test explicit import of dart:core in the source code..
 
 library ImportCoreTest.dart;
+
 import "dart:core";
 
 void main() {
-  var test = new Map<int,String>();
+  var test = new Map<int, String>();
   bool value = false;
   int variable = 10;
   num intval = 10;
 }