Remove Dartium support from test.dart.

tools/testing/dart/runtime_updater.dart

+// Copyright (c) 2012, 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 'configuration.dart';
+import 'utils.dart';
+
+Future _contentShellFuture;
+
+/// Runs "tools/get_archive.py" to download and install Content Shell.

[Bill Hesse, 2017/07/19 14:13:06]

Check runtime against drt here, and return null (or future(Null)) if the runtime
isn't drt.  Or put the check in the code that calls this, and don't call if the
runtime isn't drt.

[Bob Nystrom, 2017/07/20 00:00:00]

Done.

+Future updateContentShell(Runtime runtime, 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);
+    }
+  }
+}