Update almost all tests (except co19) to use the new try-catch syntax.

tests/language/map_literal2_negative_test.dart

Index: tests/language/map_literal2_negative_test.dart
diff --git a/tests/language/map_literal2_negative_test.dart b/tests/language/map_literal2_negative_test.dart
index 9a981bc5f05b60cb3811e08045bb6b763bb95927..e02e5d0b5bedf3d798320abdbaf37c15e26af94c 100644
--- a/tests/language/map_literal2_negative_test.dart
+++ b/tests/language/map_literal2_negative_test.dart
@@ -10,7 +10,7 @@ class MapLiteral2NegativeTest<T> {
     try {
       var m = const <String, T>{"a": 0};  // Type parameter is not allowed with
                                           // const.
-    } catch (TypeError error) {
+    } on TypeError catch (error) {
     }
   }
 }