Dart SDK Spelling b, c, and d.

tests/compiler/dart2js_extra/deferred_split_test.dart

 // Copyright (c) 2015, 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.
 
-/// Regression for issue 23853: we used to incorreclty split and put a type in a
+/// Regression for issue 23853: we used to incorrectly split and put a type in a
 /// deferred hunk if the type was used explicitly in the deferred library and
 /// was used only in a generic type in the main library.
 library compiler.test.dart2js_extra.deferred_split_test;
 
 import 'deferred_split_lib1.dart';
 import 'deferred_split_lib2.dart' deferred as b;
 
 class TypeLiteral<T> {
   Type get type => T;
 }
 
 main() {
   // This line failed with a runtime error prior to the fix:
   new TypeLiteral<A<Object>>().type;
 
   b.loadLibrary().then((_) => b.createA());
 }