Moved the testing scripts to the new import/library/part syntax

tools/testing/dart/multitest.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.
 
-#library("multitest");
+library multitest;
 
-#import("dart:io");
-#import("test_suite.dart");
+import "dart:io";
+import "test_suite.dart";
 
 // Multitests are Dart test scripts containing lines of the form
 // " [some dart code] /// [key]: [error type]"
 //
 // For each key in the file, a new test file is made containing all
 // the normal lines of the file, and all of the multitest lines containing
 // that key, in the same order as in the source file.  The new test
 // is expected to fail if there is a non-empty error type listed, of
 // type 'compile-time error', 'runtime error', 'static type warning', or
 // 'dynamic type error'.  The type error tests fail only in checked mode.
@@ skipping 240 matching lines @@
     // TestSuite.forDirectory.
     split.removeLast();
   }
   String path = '${generatedTestDir.path}/${split.last}';
   Directory dir = new Directory(path);
   if (!dir.existsSync()) {
     dir.createSync();
   }
   return new Path.fromNative(new File(path).fullPathSync());
 }