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

tests/language/expect_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.
 // Testing the Expect class.
 
 class ExpectTest {
 
   static testEquals(a) {
     try {
       Expect.equals("AB", a, "within testEquals");
-    } catch (Exception msg) {
+    } on Exception catch (msg) {
       print(msg);
       return;
     }
     Expect.equals("AB", "${a}B");
     throw "Expect.equals did not fail";
   }
 
   static testIsTrue(f) {
     try {
       Expect.isTrue(f);
-    } catch (Exception msg) {
+    } on Exception catch (msg) {
       print(msg);
       return;
     }
     Expect.isFalse(f);
     throw "Expect.isTrue did not fail";
   }
 
   static testIsFalse(t) {
     try {
       Expect.isFalse(t);
-    } catch (Exception msg) {
+    } on Exception catch (msg) {
       print(msg);
       return;
     }
     Expect.isTrue(t);
     throw "Expect.isFalse did not fail";
   }
 
   static testIdentical(a) {
     var ab = "${a}B";
     try {
       Expect.identical("AB", ab);
-    } catch (Exception msg) {
+    } on Exception catch (msg) {
       print(msg);
       return;
     }
     Expect.equals("AB", ab);
     throw "Expect.identical did not fail";
   }
 
   static testFail() {
     try {
       Expect.fail("fail now");
-    } catch (Exception msg) {
+    } on Exception catch (msg) {
       print(msg);
       return;
     }
     throw "Expect.fail did not fail";
   }
 
   static void testMain() {
     testEquals("A");
     testIsTrue(false);
     testIsTrue(1);
     testIsFalse(true);
     testIsFalse(0);
     testIdentical("A");
     testFail();
   }
 
 }
 
 main() {
   ExpectTest.testMain();
 }