Dart SDK Spelling b, c, and d.

runtime/observatory/tests/service/weak_properties_test.dart

 // Copyright (c) 2014, 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.
 // VMOptions=--error_on_bad_type --error_on_bad_override
 
 library vm_references_test;
 
 import 'dart:mirrors';
 import 'package:observatory/service_io.dart';
 import 'package:unittest/unittest.dart';
@@ skipping 37 matching lines @@
         lib.variables.singleWhere((v) => v.name == 'weak_property');
     await propField.load();
     Instance prop = propField.staticValue;
 
     expect(key.isWeakProperty, isFalse);
     expect(value.isWeakProperty, isFalse);
     expect(prop.isWeakProperty, isTrue);
     expect(prop.key, isNull);
     expect(prop.value, isNull);
     Instance loadedProp = await prop.load();
-    // Object ids are not cannonicalized, so we rely on the key and value
+    // Object ids are not canonicalized, so we rely on the key and value
     // being the sole instances of their classes to test we got the objects
     // we expect.
     expect(loadedProp.key, isNotNull);
     expect(loadedProp.key.clazz, equals(key.clazz));
     expect(loadedProp.value, isNotNull);
     expect(loadedProp.value.clazz, equals(value.clazz));
   },
 ];
 
 main(args) => runIsolateTests(args, tests, testeeBefore: script);