Rename blahHandler to onBlah throughout dart:io.

tests/standalone/src/ProcessExitNegativeTest.dart

Index: tests/standalone/src/ProcessExitNegativeTest.dart
diff --git a/tests/standalone/src/ProcessExitNegativeTest.dart b/tests/standalone/src/ProcessExitNegativeTest.dart
index b17534645eda3da0a7ca0f512568e53b3928ea50..cbcd8c01b1b88eac275b303abd37f8b98062230c 100644
--- a/tests/standalone/src/ProcessExitNegativeTest.dart
+++ b/tests/standalone/src/ProcessExitNegativeTest.dart
@@ -1,4 +1,4 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2012, 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.
 //
@@ -11,7 +11,7 @@
 void main() {
   Process p = new Process.start(getProcessTestFileName(),
                                 const ["0", "0", "0", "0"]);
-  p.exitHandler = (int s) {
+  p.onExit = (int s) {
     print(a.toString());  // Should cause a compilation error here.
     p.close();
   };