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

tests/compiler/dart2js_native/native_null_closure_frog_test.dart

 // Copyright (c) 2012, 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.
 
 typedef void MyFunctionType();
 
 class A native "*A" {
   setClosure(MyFunctionType f) native;
   check(MyFunctionType f) native;
   invoke() native;
@@ skipping 11 matching lines @@
 
 
 main() {
   setup();
   A a = makeA();
   a.setClosure(null);
   Expect.isTrue(a.check(null));
   bool caughtException = false;
   try {
     a.invoke();
-  } catch (Exception e) {
+  } on Exception catch (e) {
     caughtException = true;
   }
   Expect.isTrue(caughtException);
 }