Use a real font-family name in test to not confuse Safari.

Author: ditman

lib/web_ui/test/engine/host_node_test.dart

@@ -16,7 +16,7 @@ void testMain() {
 
   group('ShadowDomHostNode', () {
     final HostNode hostNode =
-        ShadowDomHostNode(rootNode, '14px font_family_for_testing');
+        ShadowDomHostNode(rootNode, '14px monospace');
 
     test('Initializes and attaches a shadow root', () {
       expect(domInstanceOfString(hostNode.node, 'ShadowRoot'), isTrue);
@@ -65,7 +65,7 @@ void testMain() {
 
       final bool hasFont = hasCssRule(style,
           selector: 'flt-scene-host',
-          declaration: 'font: 14px font_family_for_testing');
+          declaration: 'font: 14px monospace');
 
       expect(hasColorRed, isTrue,
           reason: 'Should make foreground color red within scene host.');