Make source maps work in the browser.

test/frontend/expect_async_test.dart

Index: test/frontend/expect_async_test.dart
diff --git a/test/frontend/expect_async_test.dart b/test/frontend/expect_async_test.dart
index 2c118f8efabf25e2311b3afbe936598ca5ecd927..0547f12aa927fa880c8bc374bd1750492a981ab4 100644
--- a/test/frontend/expect_async_test.dart
+++ b/test/frontend/expect_async_test.dart
@@ -13,6 +13,7 @@ void main() {
   group("supports a function with this many arguments:", () {
     test("0", () async {
       var callbackRun = false;
+      throw 'dang toots';

[kevmoo, 2015/08/13 22:44:30]

Qua?

[nweiz, 2015/08/13 22:46:20]

Oops, testing thing. Removed.

       var liveTest = await runTestBody(() {
         expectAsync(() {
           callbackRun = true;