Remove the Dromaeo and TodoMVC samples.

samples/third_party/dromaeo/lib/transformer.dart

-library dromaeo.transformer;
-
-import 'dart:async';
-import 'package:barback/barback.dart';
-
-/// Transformer used by `pub build` and `pub serve` to rewrite dromaeo html
-/// files to run performance tests.
-class DromaeoTransformer extends Transformer {
-
-  final BarbackSettings settings;
-
-  DromaeoTransformer.asPlugin(this.settings);
-
-  /// The index.html file and the tests/dom-*-html.html files are the ones we
-  /// apply this transform to.
-  Future<bool> isPrimary(AssetId id) {
-    var reg = new RegExp('(tests/dom-.+-html\.html\$)|(index\.html\$)');
-    return new Future.value(reg.hasMatch(id.path));
-  }
-
-  Future apply(Transform transform) {
-    Asset primaryAsset = transform.primaryInput;
-    AssetId primaryAssetId = primaryAsset.id;
-
-    return primaryAsset.readAsString().then((String fileContents) {
-      var filename = primaryAssetId.toString();
-      var outputFileContents = fileContents;
-
-      if (filename.endsWith('index.html')) {
-        var index = outputFileContents.indexOf(
-            '<script src="packages/browser/dart.js">');
-        outputFileContents = outputFileContents.substring(0, index) +
-            '<script src="packages/browser_controller' +
-            '/perf_test_controller.js"></script>\n' +
-            outputFileContents.substring(index);
-        transform.addOutput(new Asset.fromString(new AssetId.parse(
-            primaryAssetId.toString().replaceAll('.html', '-dart.html')),
-            outputFileContents));
-      }
-
-      outputFileContents = _sourceJsNotDart(outputFileContents);
-      // Rename the script to take the JavaScript source.
-      transform.addOutput(new Asset.fromString(new AssetId.parse(
-          _appendJs(primaryAssetId.toString())),
-          outputFileContents));
-    });
-  }
-
-  String _appendJs(String path) => path.replaceAll('.html', '-js.html');
-
-  /// Given an html file that sources a Dart file, rewrite the html to instead
-  /// source the compiled JavaScript file.
-  String _sourceJsNotDart(String fileContents) {
-    var dartScript = new RegExp(
-        '<script type="application/dart" src="([\\w-]+)\.dart">');
-    var match = dartScript.firstMatch(fileContents);
-    return fileContents.replaceAll(dartScript, '<script type="text/javascript"'
-        ' src="${match.group(1)+ ".dart.js"}" defer>');
-  }
-}