Updated tests/compiler/* to use new library syntax.

tests/compiler/dart2js/closure_codegen_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.
 // Test that parameters keep their names in the output.
 
-#import("compiler_helper.dart");
-#import("parser_helper.dart");
+import 'compiler_helper.dart';
+import 'parser_helper.dart';
 
 const String TEST_INVOCATION0 = r"""
 main() {
   var o = null;
   o();
 }
 """;
 
 const String TEST_INVOCATION1 = r"""
 main() {
@@ skipping 36 matching lines @@
   String generated = compileAll(TEST_BAILOUT);
   RegExp regexp = const RegExp(r'call\$0: function');
   Iterator<Match> matches = regexp.allMatches(generated).iterator();
   checkNumberOfMatches(matches, 1);
 }
 
 main() {
   closureInvocation();
   closureBailout();
 }