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

tests/language/void_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 type checks involving the void type.
 
 isCheckedMode() {
   try {
     var i = 1;
     String s = i;
     return false;
-  } catch(var e) {
+  } catch (e) {
     return true;
   }
 }
 
 void f() { return; }
 
 void f_null() { return null; }
 
 void f_1() { return 1; }
 
 void f_dyn_null() {
   var x = null;
   return x;
 }
 
 void f_dyn_1() {
   var x = 1;
   return x;
 }
 
 void f_f() { return f(); }
 
 void test(int n, void func(), bool must_get_error) {
   // Test as closure call.
   {
     bool got_type_error = false;
     try {
       var x = func();
-    } catch (TypeError error) {
+    } on TypeError catch (error) {
       got_type_error = true;
     }
     // Never a type error in production mode.
     if (isCheckedMode()) {
       Expect.isTrue(got_type_error == must_get_error);
     } else {
       Expect.isFalse(got_type_error);
     }
   }
   // Test as direct call.
   {
     bool got_type_error = false;
     try {
       var x;
       switch (n) {
         case 0: x = f(); break;
         case 1: x = f_null(); break;
         case 2: x = f_1(); break;
         case 3: x = f_dyn_null(); break;
         case 4: x = f_dyn_1(); break;
         case 5: x = f_f(); break;
       }
-    } catch (TypeError error) {
+    } on TypeError catch (error) {
       got_type_error = true;
     }
     // Never a type error in production mode.
     if (isCheckedMode()) {
       Expect.isTrue(got_type_error == must_get_error);
     } else {
       Expect.isFalse(got_type_error);
     }
   }
 }
 
 main() {
   test(0, f, false);
   test(1, f_null, false);
   test(2, f_1, true);
   test(3, f_dyn_null, false);
   test(4, f_dyn_1, true);
   test(5, f_f, false);
 }