Unbreak SDK frogc.

dart/frog/leg/frog_leg.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('frog_leg');
 
 #import('../../lib/uri/uri.dart');
-#import('../../utils/compiler/source_file.dart');
+#import('source_file.dart');
 #import('../lang.dart', prefix: 'frog');
 #import('api.dart', prefix: 'api');
 #import('io/io.dart', prefix: 'io');
 
 String relativize(Uri base, Uri uri) {
   if (base.scheme == 'file' &&
       base.scheme == uri.scheme &&
       base.userInfo == uri.userInfo &&
       base.domain == uri.domain &&
       base.port == uri.port &&
@@ skipping 72 matching lines @@
   world.legCode = code;
   world.jsBytesWritten = code.length;
   return true;
 }
 
 class AbortLeg {
   final message;
   AbortLeg(this.message);
   toString() => 'Aborted due to --throw-on-error: $message';
 }