Remove Dartium support from test.dart.

tools/testing/dart/runtime_updater.dart

+// Copyright (c) 2017, 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.
+
+import 'dart:async';
+import 'dart:io';
+
+import 'utils.dart';
+
+Future _contentShellFuture;
+
+/// Runs "tools/get_archive.py" to download and install Content Shell.
+Future updateContentShell(String drtPath) {
+  if (_contentShellFuture == null) {
+    _contentShellFuture =
+        new _RuntimeUpdater('Content Shell', 'tools/get_archive.py', 'drt')
+            .update();
+  }
+
+  return _contentShellFuture;
+}
+
+class _RuntimeUpdater {
+  String _name;
+  String _script;
+  String _option;
+
+  _RuntimeUpdater(this._name, this._script, [this._option]);
+
+  Future update() async {
+    try {
+      print('Updating $_name...');
+
+      var arguments = [TestUtils.dartDirUri.resolve(_script).toFilePath()];
+
+      if (_option != null) arguments.add(_option);
+
+      var result = await Process.run('python', arguments);
+      if (result.exitCode == 0) {
+        print('Updated $_name.');
+      } else {
+        print('Failed to update $_name (exit code ${result.exitCode}):');
+        print(result.stdout);
+        print(result.stderr);
+        exit(1);
+      }
+    } catch (error) {
+      print("Error starting $_script process: $error");
+      exit(1);
+    }
+  }
+}