Remove Dartium support from test.dart.

tools/testing/dart/runtime_configuration.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.
 
 import 'dart:io';
 
 import 'command.dart';
 import 'compiler_configuration.dart';
 import 'configuration.dart';
 // TODO(ahe): Remove this import, we can precompute all the values required
 // from TestSuite once the refactoring is complete.
 import 'test_suite.dart';
 import 'utils.dart';
 
 /// Describes the commands to run a given test case or its compiled output.
 ///
 /// A single runtime configuration object exists per test suite, and is thus
 /// shared between multiple test cases, it should not be mutated after
 /// construction.
 abstract class RuntimeConfiguration {
   factory RuntimeConfiguration(Configuration configuration) {
     switch (configuration.runtime) {
       case Runtime.contentShellOnAndroid:
-      case Runtime.dartiumOnAndroid:
       case Runtime.chrome:
       case Runtime.chromeOnAndroid:
-      case Runtime.dartium:
       case Runtime.firefox:
       case Runtime.ie11:
       case Runtime.ie10:
       case Runtime.ie9:
       case Runtime.opera:
       case Runtime.safari:
       case Runtime.safariMobileSim:
         // TODO(ahe): Replace this with one or more browser runtimes.
         return new DummyRuntimeConfiguration();
 
@@ skipping 306 matching lines @@
 // TODO(ahe): Remove this class.
 class DummyRuntimeConfiguration extends DartVmRuntimeConfiguration {
   List<Command> computeRuntimeCommands(
       TestSuite suite,
       CommandArtifact artifact,
       List<String> arguments,
       Map<String, String> environmentOverrides) {
     throw "Unimplemented runtime '$runtimeType'";
   }
 }