pkg/test: remove unused imports

lib/src/runner/browser/polymer.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.
 
 library test.runner.browser.polymer;
 
 import 'dart:io';
 
 import 'package:glob/glob.dart';
 import 'package:path/path.dart' as p;
-import 'package:pub_semver/pub_semver.dart';
 import 'package:yaml/yaml.dart';
 
 /// Whether the package being tested uses the Polymer transforemrs at all.
 ///
 /// This will be `null` until [_initialize] is called.
 bool _usesPolymer;
 
 /// The set of entry points passed in to the polymer transformer's config.
 ///
 /// This will be `null` if no entrypoints are declared, indicating that all
@@ skipping 77 matching lines @@
   var field = configuration[name];
 
   if (field is String) {
     return new Set.from([new Glob(field, context: p.url, recursive: true)]);
   }
 
   return new Set.from(field.map((node) {
     return new Glob(node, context: p.url, recursive: true);
   }));
 }