Fix tests that were broken in Chrome.

test/frontend/matcher/throws_test.dart

Index: test/frontend/matcher/throws_test.dart
diff --git a/test/frontend/matcher/throws_test.dart b/test/frontend/matcher/throws_test.dart
index b61cd7642928bdeb86bb3c54a9c926e3d0aa295a..bc5e6921dcbf9c37a1c3e0e153ab0afea2b43a64 100644
--- a/test/frontend/matcher/throws_test.dart
+++ b/test/frontend/matcher/throws_test.dart
@@ -21,7 +21,7 @@ void main() {
         }).then((liveTest) {
           expectTestFailed(liveTest,
               "Expected: throws\n"
-              "  Actual: <Closure: () => dynamic>\n"
+              "  Actual: <$closureString>\n"
               "   Which: did not throw\n");
         });
       });
@@ -54,7 +54,7 @@ void main() {
         }).then((liveTest) {
           expectTestFailed(liveTest,
               "Expected: throws 'oh no'\n"
-              "  Actual: <Closure: () => dynamic>\n"
+              "  Actual: <$closureString>\n"
               "   Which: did not throw\n");
         });
       });
@@ -76,7 +76,7 @@ void main() {
         }).then((liveTest) {
           expectTestFailed(liveTest,
               "Expected: throws 'oh no'\n"
-              "  Actual: <Closure: () => dynamic>\n"
+              "  Actual: <$closureString>\n"
               "   Which: threw 'aw dang'\n");
         });
       });
@@ -132,7 +132,7 @@ void main() {
         }).then((liveTest) {
           expectTestFailed(liveTest, startsWith(
               "Expected: throws 'oh no'\n"
-              "  Actual: <Closure: () => dynamic>\n"
+              "  Actual: <$closureString>\n"
               "   Which: threw 'aw dang'\n"));
         });
       });