Issue 250: Allow for GNU formatted errors

compiler/java/com/google/dart/compiler/testing/TestCompilerConfiguration.java

 // Copyright (c) 2011, 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.
 
 package com.google.dart.compiler.testing;
 
 import com.google.dart.compiler.Backend;
 import com.google.dart.compiler.CommandLineOptions.CompilerOptions;
 import com.google.dart.compiler.CompilerConfiguration;
 import com.google.dart.compiler.DartCompilationPhase;
@@ skipping 83 matching lines @@
   public boolean expectEntryPoint() {
     return false;
   }
 
   @Override
   public boolean shouldWarnOnNoSuchType() {
     return false;
   }
 
   @Override
-  public boolean printMachineProblems() {
-    return true;
-  }
-
-  @Override
   public boolean collectComments() {
     return false;
   }
 
   @Override
   public LibrarySource getSystemLibraryFor(String importSpec) {
     URI systemUri;
     try {
       systemUri = new URI(importSpec);
     } catch (URISyntaxException e) {
       throw new RuntimeException(e);
     }
     return new UrlLibrarySource(systemUri, this.systemLibraryManager);
   }
 
   @Override
   public CompilerOptions getCompilerOptions() {
     throw new AssertionError();
   }
+
+  @Override
+  public ErrorFormat printErrorFormat() {
+    return ErrorFormat.MACHINE;
+  }
 }