Use new library/import syntax in dart2js.

sdk/lib/_internal/compiler/compiler.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('compiler');
+library compiler;
 
-#import('dart:uri');
-#import('implementation/apiimpl.dart');
+import 'dart:uri';
+import 'implementation/apiimpl.dart';
 
 // Unless explicitly allowed, passing [:null:] for any argument to the
 // methods of library will result in a NullPointerException being
 // thrown.
 
 /**
  * Returns a future that completes to the source corresponding to
  * [uri]. If an exception occurs, the future completes with this
  * exception.
  */
@@ skipping 93 matching lines @@
   final String name;
 
   /**
    * This constructor is not private to support user-defined
    * diagnostic kinds.
    */
   const Diagnostic(this.ordinal, this.name);
 
   String toString() => name;
 }