Rename unsubscribeOnError to cancelOnError.

tests/lib/async/stream_state_test.dart

 // 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.
 
 // Test the event/callback protocol of the stream implementations.
 library stream_state_test;
 
 import "../../../pkg/unittest/lib/unittest.dart";
 import "stream_state_helper.dart";
 
@@ skipping 40 matching lines @@
      ..expectSubscription(false, false);
     t..subscribe()..add(42);
   });
 
   test("$p-sub-data-unsubonerror", () {
     var t = new StreamProtocolTest(broadcast);
     t..expectSubscription(true, false)
      ..expectData(42)
      ..expectError("bad")
      ..expectSubscription(false, !broadcast);
-    t..subscribe(unsubscribeOnError: true)
+    t..subscribe(cancelOnError: true)
      ..add(42)
      ..error("bad")
      ..add(43)
      ..close();
   });
 
   test("$p-sub-data-no-unsubonerror", () {
     var t = new StreamProtocolTest(broadcast);
     t..expectSubscription(true, false)
      ..expectData(42)
      ..expectError("bad")
      ..expectData(43)
      ..expectDone()
      ..expectSubscription(false, false);
-    t..subscribe(unsubscribeOnError: false)
+    t..subscribe(cancelOnError: false)
      ..add(42)
      ..error("bad")
      ..add(43)
      ..close();
   });
 
   test("$p-pause-resume-during-event", () {
     var t = new StreamProtocolTest(broadcast);
     t..expectSubscription(true, false)
      ..expectData(42, () {
@@ skipping 47 matching lines @@
     var t = new StreamProtocolTest(broadcast);
     t..expectSubscription(true, false)
      ..expectDone()
      ..expectSubscription(false, false)
      ..expectDone();
     t..subscribe()
      ..close()
      ..subscribe();  // Subscribe after done does not cause callbacks at all.
   });
 }