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

tests/language/function_malformed_result_type_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.
 // Dart test for a function with a malformed result type.
 
 class C<T, U> {}
 
 isCheckedMode() {
   try {
     var i = 1;
     String s = i;
     return false;
-  } catch(var e) {
+  } catch (e) {
     return true;
   }
 }
 
 main() {
   {
     C<int> f() => null;
     bool got_type_error = false;
     try {
       f();
-    } catch (TypeError error) {
+    } on TypeError catch (error) {
       got_type_error = true;
     }
     // No type error expected, since returned null is not type checked.
     Expect.isFalse(got_type_error);
   }
   {
     C<int> f() => new C<int, String>();
     bool got_type_error = false;
     try {
       f();
-    } catch (TypeError error) {
+    } on TypeError catch (error) {
       got_type_error = true;
     }
     // Type error expected in checked mode only.
     Expect.isTrue(got_type_error == isCheckedMode());
   }
 }