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

tests/language/throw6_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 throw statement
 
 class MyException1 {
   const MyException1([String message = "1"]) : message_ = message;
   final String message_;
 }
 
 class Helper {
   Helper() : i = 0 { }
 
   int f1() {
     int j = 0;
     try {
       j = func();
-    } catch (var exception) {
+    } catch (exception) {
       i = i + 100;
       print(exception.message_);
     } finally {
       i = i + 1000;
     }
     return i;
   }
 
   // No catch in the same function for the type of exception being thrown
   // in the try block here. We expect the handler if checks to fall thru,
@@ skipping 17 matching lines @@
 
 class Throw6Test {
   static testMain() {
     Expect.equals(1900, new Helper().f1());
   }
 }
 
 main() {
   Throw6Test.testMain();
 }