cleanup to tools/testing/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.
 
 library runtime_configuration;
 
-import 'compiler_configuration.dart' show
-    CommandArtifact;
-
 // TODO(ahe): Remove this import, we can precompute all the values required
 // from TestSuite once the refactoring is complete.
 import 'test_suite.dart' show
     TestSuite;
 
-import 'test_runner.dart' show
+import 'lib/command.dart' show
     Command,
     CommandBuilder;
 
+/// Grouping of a command with its expected result.
+class CommandArtifact {
+  final List<Command> commands;
+
+  /// Expected result of running [command].
+  final String filename;
+
+  /// MIME type of [filename].
+  final String mimeType;
+
+  CommandArtifact(this.commands, this.filename, this.mimeType);
+}
+
 // TODO(ahe): I expect this class will become abstract very soon.
 class RuntimeConfiguration {
   // TODO(ahe): Remove this constructor and move the switch to
   // test_options.dart.  We probably want to store an instance of
   // [RuntimeConfiguration] in [configuration] there.
   factory RuntimeConfiguration(Map configuration) {
     String runtime = configuration['runtime'];
     switch (runtime) {
       case 'ContentShellOnAndroid':
       case 'DartiumOnAndroid':
@@ skipping 193 matching lines @@
 class DummyRuntimeConfiguration extends DartVmRuntimeConfiguration {
   List<Command> computeRuntimeCommands(
       TestSuite suite,
       CommandBuilder commandBuilder,
       CommandArtifact artifact,
       List<String> arguments,
       Map<String, String> environmentOverrides) {
     throw "Unimplemented runtime '$runtimeType'";
   }
 }