Delete polymer from the Dart repo

pkg/polymer/lib/src/build/mirrors_remover.dart

-// Copyright (c) 2014, 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.
-
-/// Transformer that removes uses of mirrors from the polymer runtime, so that
-/// deployed applications are thin and small.
-library polymer.src.build.mirrors_remover;
-
-import 'dart:async';
-import 'package:barback/barback.dart';
-
-/// Removes the code-initialization logic based on mirrors.
-class MirrorsRemover extends Transformer {
-  MirrorsRemover.asPlugin();
-
-  /// Only apply to `lib/polymer.dart`.
-  // TODO(nweiz): This should just take an AssetId when barback <0.13.0 support
-  // is dropped.
-  Future<bool> isPrimary(idOrAsset) {
-    var id = idOrAsset is AssetId ? idOrAsset : idOrAsset.id;
-    return new Future.value(
-        id.package == 'polymer' && id.path == 'lib/polymer.dart');
-  }
-
-  Future apply(Transform transform) {
-    var id = transform.primaryInput.id;
-    return transform.primaryInput.readAsString().then((code) {
-      // Note: this rewrite is highly-coupled with how polymer.dart is
-      // written. Make sure both are updated in sync.
-      var start = code.indexOf('@MirrorsUsed(');
-      if (start == -1) _error();
-      var end = code.indexOf('show MirrorsUsed;', start);
-      if (end == -1) _error();
-      end = code.indexOf('\n', end);
-      var loaderImport = code.indexOf(
-          "import 'src/mirror_loader.dart' as loader;", end);
-      if (loaderImport == -1) _error();
-      var sb = new StringBuffer()
-          ..write(code.substring(0, start))
-          ..write(code.substring(end)
-              .replaceAll('src/mirror_loader.dart', 'src/static_loader.dart'));
-
-      transform.addOutput(new Asset.fromString(id, sb.toString()));
-    });
-  }
-}
-
-/** Transformer phases which should be applied to the smoke package. */
-List<List<Transformer>> get phasesForSmoke =>
-    [[new MirrorsRemover.asPlugin()]];
-
-_error() => throw new StateError("Couldn't remove imports to mirrors, maybe "
-    "polymer.dart was modified, but mirrors_remover.dart wasn't.");