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

tests/language/double_to_string_as_fixed_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.
 // Test basic integer operations.
 
 class ToStringAsFixedTest {
   static void testMain() {
     Expect.equals("2.000", 2.0.toStringAsFixed(3));
     Expect.equals("2.100", 2.1.toStringAsFixed(3));
     Expect.equals("2.120", 2.12.toStringAsFixed(3));
@@ skipping 71 matching lines @@
     // dtoa does not do this in its original form.
     Expect.equals("1", 0.5.toStringAsFixed(0));
     Expect.equals("-1", (-0.5).toStringAsFixed(0));
     Expect.equals("1.3", 1.25.toStringAsFixed(1));
     Expect.equals("234.2040", 234.20405.toStringAsFixed(4));
     Expect.equals("234.2041", 234.2040506.toStringAsFixed(4));
     {
       bool thrown = false;
       try {
         0.0.toStringAsFixed(-1);
-      } catch (final e) {
+      } catch (e) {
         thrown = true;
       }
       Expect.equals(true, thrown);
     }
     {
       bool thrown = false;
       try {
         0.0.toStringAsFixed(22);
-      } catch (final e) {
+      } catch (e) {
         thrown = true;
       }
       Expect.equals(true, thrown);
     }
   }
 }
 
 
 main() {
   ToStringAsFixedTest.testMain();
 }