"new Map()" -> "new Map.from()" in pub.

utils/tests/pub/test_pub.dart

 // Copyright (c) 2013, 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 infrastructure for testing pub. Unlike typical unit tests, most pub
 /// tests are integration tests that stage some stuff on the file system, run
 /// pub, and then validate the results. This library provides an API to build
 /// tests like that.
 library test_pub;
 
@@ skipping 333 matching lines @@
   var pubPath = fs.joinPaths(testDirectory, '../../pub/pub.dart');
 
   var dartArgs = ['--checked', pubPath, '--trace'];
   dartArgs.addAll(args);
 
   if (tokenEndpoint == null) tokenEndpoint = new Future.immediate(null);
   var optionsFuture = tokenEndpoint.then((tokenEndpoint) {
     var options = new ProcessOptions();
     options.workingDirectory = pathInSandbox(appPath);
     // TODO(nweiz): remove this when issue 9294 is fixed.
-    options.environment = new Map(Platform.environment);
+    options.environment = new Map.from(Platform.environment);
     options.environment['PUB_CACHE'] = pathInSandbox(cachePath);
     options.environment['DART_SDK'] = pathInSandbox(sdkPath);
     if (tokenEndpoint != null) {
       options.environment['_PUB_TEST_TOKEN_ENDPOINT'] =
         tokenEndpoint.toString();
     }
     return options;
   });
 
   return new ScheduledProcess.start(dartBin, dartArgs, options: optionsFuture,
@@ skipping 212 matching lines @@
   bool matches(item, MatchState matchState) {
     if (item is! Pair) return false;
     return _firstMatcher.matches(item.first, matchState) &&
         _lastMatcher.matches(item.last, matchState);
   }
 
   Description describe(Description description) {
     description.addAll("(", ", ", ")", [_firstMatcher, _lastMatcher]);
   }
 }