Dart SDK Spelling b, c, and d.

runtime/observatory/tests/service/weak_properties_test.dart

Index: runtime/observatory/tests/service/weak_properties_test.dart
diff --git a/runtime/observatory/tests/service/weak_properties_test.dart b/runtime/observatory/tests/service/weak_properties_test.dart
index a7705e8693757d84572647dfeb762a43c53aa6d6..72325d3804a5d046e21b3325e96057888880f1cd 100644
--- a/runtime/observatory/tests/service/weak_properties_test.dart
+++ b/runtime/observatory/tests/service/weak_properties_test.dart
@@ -55,7 +55,7 @@ var tests = [
     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);