Fix test/runner/signal_test.

test/runner/signal_test.dart

 // Copyright (c) 2015, 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.
 
 @TestOn("vm")
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 
@@ skipping 130 matching lines @@
     return new Future(() {
       // Loop forever so that if the test isn't stopped while running, it never
       // stops.
       while (true) {}
     });
   });
 }
 """);
 
       return _startTest(["-p", "content-shell", "test.dart"]).then((process) {
-        return _lines.bind(process.stdout).skip(3).first.then((line) {
+        return _lines.bind(process.stdout).skip(2).first.then((line) {

[kevmoo, 2015/04/23 00:07:53]

understanding why it's 2 and not three would be nice – for the next dev that
maintains this

[nweiz, 2015/04/23 00:12:06]

Done.

           expect(line, equals("running test"));
           process.kill();
           return process.exitCode;
         }).then((_) {
           expect(new Directory(_tempDir).listSync(), isEmpty);
         });
       });
     });
 
     test("kills a VM test immediately if ^C is sent twice", () {
@@ skipping 106 matching lines @@
       });
     });
   });
 }
 
 Future<Process> _startTest(List<String> args) {
   new Directory(_tempDir).create();
   return startTest(args, workingDirectory: _sandbox,
       environment: {"_UNITTEST_TEMP_DIR": _tempDir});
 }