Simplify test_suite.dart.

tools/testing/dart/compiler_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 'configuration.dart';
 import 'runtime_configuration.dart';
 import 'test_runner.dart';
 import 'test_suite.dart';
+import 'utils.dart';
 
 List<String> replaceDartFileWith(List<String> list, String replacement) {
   var copy = new List<String>.from(list);
   for (var i = 0; i < copy.length; i++) {
     if (copy[i].endsWith(".dart")) {
       copy[i] = replacement;
     }
   }
   return copy;
 }
@@ skipping 244 matching lines @@
         environmentOverrides);
   }
 
   CommandArtifact computeCompilationArtifact(
       String buildDir,
       String tempDir,
       CommandBuilder commandBuilder,
       List<String> arguments,
       Map<String, String> environmentOverrides) {
     return new CommandArtifact(<Command>[
-      this.computeCompilationCommand('$tempDir/out.dill', buildDir,
+      computeCompilationCommand('$tempDir/out.dill', buildDir,
           CommandBuilder.instance, arguments, environmentOverrides)
     ], '$tempDir/out.dill', 'application/dart');
   }
 
   List<String> computeRuntimeArguments(
       RuntimeConfiguration runtimeConfiguration,
       String buildDir,
       TestInformation info,
       List<String> vmOptions,
       List<String> sharedOptions,
@@ skipping 650 matching lines @@
       RuntimeConfiguration runtimeConfiguration,
       String buildDir,
       TestInformation info,
       List<String> vmOptions,
       List<String> sharedOptions,
       List<String> originalArguments,
       CommandArtifact artifact) {
     return <String>[];
   }
 }