Dart SDK Spelling b, c, and d.

pkg/dev_compiler/tool/input_sdk/private/js_array.dart

Index: pkg/dev_compiler/tool/input_sdk/private/js_array.dart
diff --git a/pkg/dev_compiler/tool/input_sdk/private/js_array.dart b/pkg/dev_compiler/tool/input_sdk/private/js_array.dart
index 619a56d684b3e1d32d2c213ce865fdd1651e2267..dc9564eb0e507b5343d63b1585d9d1f4a308ea70 100644
--- a/pkg/dev_compiler/tool/input_sdk/private/js_array.dart
+++ b/pkg/dev_compiler/tool/input_sdk/private/js_array.dart
@@ -584,7 +584,7 @@ class JSArray<E> implements List<E>, JSIndexable<E> {
  * getInterceptor always returns JSArray.  We should consider pushing the
  * 'isGrowable' and 'isMutable' checks into the getInterceptor implementation so
  * these classes can have specialized implementations. Doing so will challenge
- * many assuptions in the JS backend.
+ * many assumptions in the JS backend.
  */
 class JSMutableArray<E> extends JSArray<E> {}