lib/convert: removed unused import, removed redundant test

tests/lib/convert/json_lib_test.dart

Index: tests/lib/convert/json_lib_test.dart
diff --git a/tests/lib/convert/json_lib_test.dart b/tests/lib/convert/json_lib_test.dart
index f820273921f213d2852f8c54e6cb60cfc3801259..1226f7bb907276c1af0b997f97f62f1d43b7538e 100644
--- a/tests/lib/convert/json_lib_test.dart
+++ b/tests/lib/convert/json_lib_test.dart
@@ -81,9 +81,8 @@ main() {
     expect(JSON.encode(null), equals('null'));
     expect(JSON.encode(' hi there" bob '), equals('" hi there\\" bob "'));
     expect(JSON.encode('hi\\there'), equals('"hi\\\\there"'));
-    // TODO(devoncarew): these tests break the dartium build

[ricow1, 2014/04/03 05:29:22]

Devon: is there a bug for this that we can close off

[devoncarew, 2014/04/03 07:24:28]

Sorry, no. This comment dates back to when I started on the Dart project - I've
lost a bit of context :)

I _think_ this comment was here because my CL at the time also included a fix to
the stringify implementation. At the time, the bots would run the tests against
the current version of Dartium, and not the one that was building w/ the changed
encoding.

-    //expect(JSON.encode('hi\nthere'), equals('"hi\\nthere"'));
-    //expect(JSON.encode('hi\r\nthere'), equals('"hi\\r\\nthere"'));
+    expect(JSON.encode('hi\nthere'), equals('"hi\\nthere"'));
+    expect(JSON.encode('hi\r\nthere'), equals('"hi\\r\\nthere"'));
     expect(JSON.encode(''), equals('""'));
 
     // Lists.