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

tests/language/statement_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.
 
 // Tests all statement types. Not an exhaustive test of all statement semantics.
 class StatementTest {
 
   StatementTest() {}
 
   static testMain() {
@@ skipping 118 matching lines @@
     Expect.equals(true, hitA);
     Expect.equals(true, hitB);
     Expect.equals(true, hitDefault);
   }
 
   testExceptions() {
     // TODO(jgw): Better tests once all the exception semantics are worked out.
     bool hitCatch, hitFinally;
     try {
       throw "foo";
-    } catch (var e) {
+    } catch (e) {
       Expect.equals(true, e == "foo");
       hitCatch = true;
     } finally {
       hitFinally = true;
     }
 
     Expect.equals(true, hitCatch);
     Expect.equals(true, hitFinally);
   }
 
@@ skipping 50 matching lines @@
     if (true) {
       return;
     }
     Expect.equals(true, false);
   }
 }
 
 main() {
   StatementTest.testMain();
 }