[polymer] fix editor hints -- query/queryAll and unused imports

pkg/polymer/lib/src/build/runner.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.
 
 /**
  * Definitions used to run the polymer linter and deploy tools without using
  * pub serve or pub deploy.
  */
 library polymer.src.build.runner;
 
@@ skipping 258 matching lines @@
     }
 
     return _writeAsset(filepath, asset);
   });
 }
 
 /**
  * Adds a package symlink from each directory under `out/web/foo/` to
  * `out/packages`.
  */
-Future _addPackagesSymlinks(AssetSet assets, BarbackOptions options) {
+void _addPackagesSymlinks(AssetSet assets, BarbackOptions options) {
   var outPackages = path.join(options.outDir, 'packages');
   var currentPackage = options.currentPackage;
   for (var asset in assets) {
     var id = asset.id;
     if (id.package != currentPackage) continue;
     var firstDir = _firstDir(id.path);
     if (firstDir == null) continue;
 
     if (firstDir == 'web' || (options.transformTests && firstDir == 'test')) {
       var dir = path.join(options.outDir, path.dirname(_toSystemPath(id.path)));
@@ skipping 99 matching lines @@
     output.write(entry.span.getLocationMessage(entry.message,
           useColors: useColors,
           color: levelColor));
   }
   return output.toString();
 }
 
 const String _RED_COLOR = '\u001b[31m';
 const String _MAGENTA_COLOR = '\u001b[35m';
 const String _NO_COLOR = '\u001b[0m';