Support new import syntax.

lib/compiler/implementation/tree/unparser.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.
 
 String unparse(Node node) {
   Unparser unparser = new Unparser();
   unparser.unparse(node);
   return unparser.result;
 }
 
@@ skipping 425 matching lines @@
 
   visitSwitchCase(SwitchCase node) {
     visit(node.labelsAndCases);
     if (node.isDefaultCase) {
       sb.add('default:');
     }
     visit(node.statements);
   }
 
   unparseImportTag(String uri, [String prefix]) {
-    final suffix = prefix === null ? '' : ',prefix:"$prefix"';
-    sb.add('#import("$uri"$suffix);');
+    final suffix = prefix === null ? '' : ' as $prefix';
+    sb.add('import "$uri"$suffix;');
   }
 
   visitScriptTag(ScriptTag node) {
     add(node.beginToken.value);
     visit(node.tag);
     sb.add('(');
     visit(node.argument);
     if (node.prefixIdentifier !== null) {
       visit(node.prefixIdentifier);
       sb.add(':');
@@ skipping 80 matching lines @@
     add(node.getEndToken().value);
   }
 
   visitPartOf(PartOf node) {
     addToken(node.partKeyword);
     addToken(node.ofKeyword);
     visit(node.name);
     add(node.getEndToken().value);
   }
 }