Update test expectation for Safari to account for JSON.parse bug.

tests/lib/convert/json_test.dart

Index: tests/lib/convert/json_test.dart
diff --git a/tests/lib/convert/json_test.dart b/tests/lib/convert/json_test.dart
index e1bc6b29776ed97277c1c09f3aef48392a5348e7..0cf304897263aa76bb5f2a55a6fe9e7f3e8eb692 100644
--- a/tests/lib/convert/json_test.dart
+++ b/tests/lib/convert/json_test.dart
@@ -82,10 +82,7 @@ testNumbers() {
       for (var fraction in fractionList) {
         for (var exp in exponentList) {
           var literal = "$sign$integer$fraction$exp";
-          var parseNumber =
-              ((fraction == "" && exp == "") ? (String x) => int.parse(x)
-                                             : (String x) => double.parse(x));
-          var expectedValue = parseNumber(literal);
+          var expectedValue = num.parse(literal);
           testJson(literal, expectedValue);
         }
       }