Renaming Element.dataAttributes to Element.dataset.

tests/html/element_test.dart

Index: tests/html/element_test.dart
diff --git a/tests/html/element_test.dart b/tests/html/element_test.dart
index d838efa73356f80a69645732711864d29fafad24..680face391c428c9fa974ac088c8f2b44ddfc8f9 100644
--- a/tests/html/element_test.dart
+++ b/tests/html/element_test.dart
@@ -298,23 +298,23 @@ main() {
         expect(attributes['data-foo'], 'bar');
         expect(attributes['data-foo2'], 'bar2');
         expect(attributes.length, 5);
-        expect(element.dataAttributes.length, 2);
-        element.dataAttributes['foo'] = 'baz';
-        expect(element.dataAttributes['foo'], 'baz');
+        expect(element.dataset.length, 2);
+        element.dataset['foo'] = 'baz';
+        expect(element.dataset['foo'], 'baz');
         expect(attributes['data-foo'], 'baz');
         attributes['data-foo2'] = 'baz2';
         expect(attributes['data-foo2'], 'baz2');
-        expect(element.dataAttributes['foo2'], 'baz2');
+        expect(element.dataset['foo2'], 'baz2');
         expect(attributes['dir'], 'rtl');
 
-        final dataAttributes = element.dataAttributes;
-        dataAttributes.remove('foo2');
+        final dataset = element.dataset;
+        dataset.remove('foo2');
         expect(attributes.length, 4);
-        expect(dataAttributes.length, 1);
+        expect(dataset.length, 1);
         attributes.remove('style');
         expect(attributes.length, 3);
-        dataAttributes['foo3'] = 'baz3';
-        expect(dataAttributes.length, 2);
+        dataset['foo3'] = 'baz3';
+        expect(dataset.length, 2);
         expect(attributes.length, 4);
         attributes['style'] = 'width: 300px;';
         expect(attributes.length, 5);