Revert "Use browsers JSON.parse for parsing JSON (#3)"

tests/corelib/json_test.dart

Index: tests/corelib/json_test.dart
diff --git a/tests/corelib/json_test.dart b/tests/corelib/json_test.dart
index a5f769f7f6b4d03e5f29600c76490b846954e874..75d22a3bd89e1d7086ae60958646a29e13d7f681 100644
--- a/tests/corelib/json_test.dart
+++ b/tests/corelib/json_test.dart
@@ -97,11 +97,8 @@ testNumbers() {
 
   // Integer part cannot be omitted:
   testError(integers: "");
-
-  // Test for "Initial zero only allowed for zero integer part" moved to
-  // json_leading_zeros_test.dart because IE's JSON.parse accepts additional
-  // initial zeros.
-
+  // Initial zero only allowed for zero integer part.
+  testError(integers: ["00", "01"]);
   // Only minus allowed as sign.
   testError(signs: "+");
   // Requires digits after decimal point.