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

tests/compiler/dart2js/no_duplicate_constructor_body_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.
 
-#import("compiler_helper.dart");
+import 'compiler_helper.dart';
 
 const String CODE = """
 class A {
   A(String b) { b.length; }
 }
 
 main() {
   new A("foo");
 }
 """;
 
 main() {
   String generated = compileAll(CODE);
   RegExp regexp = new RegExp(r'\$.A = {"":');
   Iterator<Match> matches = regexp.allMatches(generated).iterator();
   checkNumberOfMatches(matches, 1);
 }