dart:js_util - fix spelling

sdk/lib/js_util/dartium/js_util_dartium.dart

Index: sdk/lib/js_util/dartium/js_util_dartium.dart
diff --git a/sdk/lib/js_util/dartium/js_util_dartium.dart b/sdk/lib/js_util/dartium/js_util_dartium.dart
index 5f1226d66733e18ddd7e480a381065671a7a8482..77386dccf778c5095a0af0986618079203605cb0 100644
--- a/sdk/lib/js_util/dartium/js_util_dartium.dart
+++ b/sdk/lib/js_util/dartium/js_util_dartium.dart
@@ -11,7 +11,7 @@ library dart.js_util;
 
 import 'dart:js';
 
-/// WARNING: performance of this method is much worse than other uitil
+/// WARNING: performance of this method is much worse than other util
 /// methods in this library. Only use this method as a last resort.
 ///
 /// Recursively converts a JSON-like collection of Dart objects to a
@@ -19,7 +19,7 @@ import 'dart:js';
 ///
 /// [object] must be a [Map] or [Iterable], the contents of which are also
 /// converted. Maps and Iterables are copied to a new JavaScript object.
-/// Primitives and other transferrable values are directly converted to their
+/// Primitives and other transferable values are directly converted to their
 /// JavaScript type, and all other objects are proxied.
 jsify(object) {
   if ((object is! Map) && (object is! Iterable)) {