Removed fixed dependencies

packages/package_config/lib/discovery_analysis.dart

 // Copyright (c) 2015, 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.
 
 /// Analyse a directory structure and find packages resolvers for each
 /// sub-directory.
 ///
 /// The resolvers are generally the same that would be found by using
 /// the `discovery.dart` library on each sub-directory in turn,
 /// but more efficiently and with some heuristics for directories that
 /// wouldn't otherwise have a package resolution strategy, or that are
 /// determined to be "package directories" themselves.
 library package_config.discovery_analysis;
 
+import "dart:collection" show HashMap;
 import "dart:io" show File, Directory;
-import "dart:collection" show HashMap;
 
 import "package:path/path.dart" as path;
 
 import "packages.dart";
 import "packages_file.dart" as pkgfile;
 import "src/packages_impl.dart";
 import "src/packages_io_impl.dart";
 
 /// Associates a [Packages] package resolution strategy with a directory.
 ///
@@ skipping 129 matching lines @@
     return true;
   }
 }
 
 Packages _loadPackagesFile(File file) {
   var uri = new Uri.file(file.path);
   var bytes = file.readAsBytesSync();
   var map = pkgfile.parse(bytes, uri);
   return new MapPackages(map);
 }