Fix read handler bug in tools/test.dart: Replace dataHandler with lineHandler if using readLine.

tools/testing/dart/test_suite.dart

 // 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.
 
 #library("test_suite");
 
 #import("status_file_parser.dart");
 #import("test_runner.dart");
 #import("multitest.dart");
 
 #source("browser_test.dart");
 
 interface TestSuite {
   void forEachTest(Function onTest, Map testCache, [Function onDone]);
 }
 
 
 class CCTestListerIsolate extends Isolate {
   CCTestListerIsolate() : super.heavy();
 
   void main() {
     port.receive((String runnerPath, SendPort replyTo) {
       var p = new Process(runnerPath, ["--list"]);
       StringInputStream stdoutStream = new StringInputStream(p.stdout);
       List<String> tests = new List<String>();
-      stdoutStream.dataHandler = () {
+      stdoutStream.lineHandler = () {
         String line = stdoutStream.readLine();
         while (line != null) {
           tests.add(line);
           line = stdoutStream.readLine();
         }
       };
       p.exitHandler = (code) {
         if (code < 0) {
           print("Failed to list tests: $runnerPath --list");
           replyTo.send("");
@@ skipping 685 matching lines @@
  * $noCrash tests are expected to be flaky but not crash
  * $pass tests are expected to pass
  * $failOk tests are expected to fail that we won't fix
  * $fail tests are expected to fail that we should fix
  * $crash tests are expected to crash that we should fix
  * $timeout tests are allowed to timeout\
 """;
     print(report);
   }
 }