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

tests/language/named_parameters_with_conversions_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.
 //
 // Test named arguments work as expected regardless of whether the function or
 // method is called via function call syntax or method call syntax.
 
 
 Validate(tag, a, b) {
   // tag encodes which parameters are passed in with values a: 111, b: 222.
@@ skipping 46 matching lines @@
   }
 }
 
 
 class NamedParametersWithConversionsTest {
 
   static checkException(thunk) {
     bool threw = false;
     try {
       thunk();
-    } catch (var e) {
+    } catch (e) {
       threw = true;
     }
     Expect.isTrue(threw);
   }
 
   static testMethodCallSyntax(a) {
     a.foo('');
     a.foo('a', 111);
     a.foo('ab', 111, 222);
     a.foo('a', a: 111);
@@ skipping 37 matching lines @@
     // 'Conversion' calls where method/field call syntax does not match the
     // object.
     testMethodCallSyntax(new HasField());
     testFunctionCallSyntax(new HasMethod());
   }
 }
 
 main() {
   NamedParametersWithConversionsTest.testMain();
 }