Don't quit debugger when the program terminates, only after `quit`.

tests/dartino_compiler/incremental/incremental_test_runner.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 dartino_compiler.test.incremental_test_runner;
 
 import 'dart:io' hide
     exitCode,
     stderr,
     stdin,
@@ skipping 30 matching lines @@
         IncrementalCompiler;
 
 import 'package:dartino_compiler/vm_commands.dart' show
     VmCommand;
 
 import 'package:dartino_compiler/src/dartino_compiler_implementation.dart' show
     OutputProvider;
 
 import 'package:dartino_compiler/dartino_system.dart' show
     DartinoDelta,
-    DartinoFunction,
     DartinoSystem;
 
 import 'package:dartino_compiler/src/dartino_compiler_options.dart' show
     DartinoCompilerOptions,
     IncrementalMode;
 
 import 'program_result.dart' show
     EncodedResult,
     ProgramResult;
 
@@ skipping 273 matching lines @@
 
   Future<List<int>> readUtf8BytesFromUri(Uri uri) {
     throw "not supported";
   }
 
   static String readCachedFile(Uri uri) {
     return cachedFiles.putIfAbsent(
         uri, () => new File.fromUri(uri).readAsStringSync());
   }
 }