Reapply expanding overloaded functions into separate functions.

tests/html/url_test.dart

Index: tests/html/url_test.dart
diff --git a/tests/html/url_test.dart b/tests/html/url_test.dart
index 2b3260bdb3b9ae40a5bab87a41fa7fd296c06622..c9bd37442691224b084fa2b6cb990ab1f18df606 100644
--- a/tests/html/url_test.dart
+++ b/tests/html/url_test.dart
@@ -35,9 +35,9 @@ main() {
   }
 
   group('blob', () {
-    test('createObjectUrl', () {
+    test('createObjectUrlFromBlob', () {
       var blob = createImageBlob();
-      var url = Url.createObjectUrl(blob);
+      var url = Url.createObjectUrlFromBlob(blob);
       expect(url.length, greaterThan(0));
       expect(url, startsWith('blob:'));
 
@@ -55,7 +55,7 @@ main() {
 
     test('revokeObjectUrl', () {
       var blob = createImageBlob();
-      var url = Url.createObjectUrl(blob);
+      var url = Url.createObjectUrlFromBlob(blob);
       expect(url, startsWith('blob:'));
       Url.revokeObjectUrl(url);