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

tests/language/named_parameters9_negative_test.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 // Dart test program for testing named parameters.
 
 
 class NamedParameters9NegativeTest {
 
   static int f(a [b = 42]) => b;  // Missing comma.
 
   static testMain() {
     try {
       f(10, 25);
-    } catch (var e) {
+    } catch (e) {
       // This is a negative test that should not compile.
       // If it runs due to a bug, catch and ignore exceptions.
     }
   }
 }
 
 main() {
   NamedParameters9NegativeTest.testMain();
 }