Rename blahHandler to onBlah throughout dart:io.

tests/standalone/src/ProcessStartExceptionTest.dart

Index: tests/standalone/src/ProcessStartExceptionTest.dart
diff --git a/tests/standalone/src/ProcessStartExceptionTest.dart b/tests/standalone/src/ProcessStartExceptionTest.dart
index 38b3610c7c9d89fef2503996ac5a3cc989dffd3d..aa7de7f3ee9fdf4167b1340a1dac79b40c4d55df 100644
--- a/tests/standalone/src/ProcessStartExceptionTest.dart
+++ b/tests/standalone/src/ProcessStartExceptionTest.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.
 //
@@ -13,11 +13,11 @@ class ProcessStartExceptionTest {
         new Process.start("__path_to_something_that_should_not_exist__",
                           const []);
 
-    process.exitHandler = (int exitCode) {
+    process.onExit = (int exitCode) {
       Expect.fail("exit handler called");
     };
 
-    process.errorHandler = (ProcessException e) {
+    process.onError = (ProcessException e) {
       Expect.equals(2, e.errorCode);
     };
   }