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

tests/lib/math/math_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.
 
 #library("math_test.dart");
 #import("dart:math");
 
 class MathTest {
   static void testConstants() {
     // Source for mathematical constants is Wolfram Alpha.
@@ skipping 137 matching lines @@
   static void testPow() {
     checkVeryClose(16.0, pow(4.0, 2.0));
     checkVeryClose(SQRT2, pow(2.0, 0.5));
     checkVeryClose(SQRT1_2, pow(0.5, 0.5));
   }
 
   static bool parseIntThrowsFormatException(str) {
     try {
       parseInt(str);
       return false;
-    } catch (FormatException e) {
+    } on FormatException catch (e) {
       return true;
     }
   }
 
   static void testParseInt() {
     Expect.equals(499, parseInt("499"));
     Expect.equals(499, parseInt("+499"));
     Expect.equals(-499, parseInt("-499"));
     Expect.equals(499, parseInt("   499   "));
     Expect.equals(499, parseInt("   +499   "));
@@ skipping 82 matching lines @@
     testLog();
     testExp();
     testPow();
     testParseInt();
   }
 }
 
 main() {
   MathTest.testMain();
 }