Update navigator.share API to match draft specs.

third_party/WebKit/LayoutTests/webshare/share-success.html

Index: third_party/WebKit/LayoutTests/webshare/share-success.html
diff --git a/third_party/WebKit/LayoutTests/webshare/share-success.html b/third_party/WebKit/LayoutTests/webshare/share-success.html
index aa29c72f8b77c3a4acf4ceb67b428c37be124795..770b349ffa76833fc9f51c36c59ecf8ad541d110 100644
--- a/third_party/WebKit/LayoutTests/webshare/share-success.html
+++ b/third_party/WebKit/LayoutTests/webshare/share-success.html
@@ -7,7 +7,13 @@
 
 share_test((t, mock) => {
   mock.pushShareResult('the title', 'the message', null);
-  return navigator.share('the title', 'the message');
+  return navigator.share({title: 'the title', text: 'the message',
+                          url: 'the URL'});
 }, 'successful share');
 
+share_test((t, mock) => {
+  mock.pushShareResult('', '', null);
+  return navigator.share({});
+}, 'successful share with empty ShareData');
+
 </script>