Reapply "Update the test runner to use the new dart:io API"

tools/release/version.dart

Index: tools/release/version.dart
diff --git a/tools/release/version.dart b/tools/release/version.dart
index 73ef164023ca582eb62193f8ce38e0c4fefb32cd..74e1e66363d0dde9d2c933a661e1926ce3ab97be 100644
--- a/tools/release/version.dart
+++ b/tools/release/version.dart
@@ -1,4 +1,4 @@
-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2013, 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.
 
@@ -62,9 +62,10 @@ class Version {
         completeError("No VERSION file");
         return;
       }
-      StringInputStream input = new StringInputStream(f.openInputStream());
-      input.onLine = () {
-        var line = input.readLine().trim();
+      Stream<String> stream =
+          f.openRead().transform(new StringDecoder())
+                      .transform(new LineTransformer());
+      stream.listen((String line) {
         if (line == null) {
           completeError(
               "VERSION input file seems to be in the wrong format");
@@ -101,8 +102,8 @@ class Version {
                             "contain one of {MAJOR, MINOR, BUILD, PATCH}");
             return;
         }
-      };
-      input.onClosed = () {
+      },
+      onDone: () {
         // Only complete if we did not already complete with a failure.
         if (!wasCompletedWithError) {
           getRevision().then((revision) {
@@ -117,7 +118,7 @@ class Version {
             return;
           });
         }
-      };
+      });
     });
     return c.future;
   }