cleanup to tools/testing/dart

tools/testing/dart/compiler_configuration.dart

Index: tools/testing/dart/compiler_configuration.dart
diff --git a/tools/testing/dart/compiler_configuration.dart b/tools/testing/dart/compiler_configuration.dart
index 668804a361ae5f852b267da6d1aa989aa6664a93..64b752cc2ae1a66ccdab8b8fc58c642a32599d84 100644
--- a/tools/testing/dart/compiler_configuration.dart
+++ b/tools/testing/dart/compiler_configuration.dart
@@ -7,30 +7,11 @@ library compiler_configuration;
 import 'dart:io' show
     Platform;
 
-import 'runtime_configuration.dart' show
-    RuntimeConfiguration;
+import 'lib/command.dart';
+import 'lib/test_information.dart';
+import 'lib/test_utils.dart';
 
-import 'test_runner.dart' show
-    Command,
-    CommandBuilder,
-    CompilationCommand;
-
-import 'test_suite.dart' show
-    TestInformation,
-    TestUtils;
-
-/// 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);
-}
+import 'runtime_configuration.dart';
 
 Uri nativeDirectoryToUri(String nativePath) {
   Uri uri = new Uri.file(nativePath);