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

tests/standalone/io/fuzz_support.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.
 
 #library('fuzz_support');
 
 #import('dart:io');
 
 const typeMapping = const {
   'null': null,
@@ skipping 22 matching lines @@
           result.add([v, v2, v3]);
         });
       });
     });
   }
   return result;
 }
 
 // Perform sync operation and ignore all exceptions.
 doItSync(Function f) {
-  try { f(); } catch (var e) {}
+  try { f(); } catch (e) {}
 }
 
 // Perform async operation and transform the future for the operation
 // into a future that never fails by treating errors as normal
 // completion.
 Future doItAsync(Function f) {
   // Ignore value and errors.
   var completer = new Completer();
   var future = f();
   future.handleException((e) {
     completer.complete(true);
     return true;
   });
   future.then((v) => completer.complete(true));
   return completer.future;
 }