Second round of cleanups for new optional parameter semantics.

tests/compiler/dart2js/builtin_interceptor_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.
 
 #import("compiler_helper.dart");
 
 const String TEST_ONE = r"""
 foo(String a) {
   // index into the parameter and move into a loop to make sure we'll get a
   // type guard.
@@ skipping 16 matching lines @@
 }
 """;
 
 const String TEST_FOUR = r"""
 foo() {
   return new List().add(2);
 }
 """;
 
 main() {
-  String generated = compile(TEST_ONE, 'foo');
+  String generated = compile(TEST_ONE, entry: 'foo');
   Expect.isTrue(generated.contains("return a.length;"));
 
-  generated = compile(TEST_TWO, 'foo');
+  generated = compile(TEST_TWO, entry: 'foo');
   Expect.isTrue(generated.contains("return 3;"));
 
-  generated = compile(TEST_THREE, 'foo');
+  generated = compile(TEST_THREE, entry: 'foo');
   Expect.isTrue(generated.contains("return 3;"));
 
-  generated = compile(TEST_FOUR, 'foo');
+  generated = compile(TEST_FOUR, entry: 'foo');
   Expect.isTrue(generated.contains("push(2);"));
 }