Reapply "Remove @deprecated features."

samples/build_dart/build.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 build_dart;
 
 import "dart:io";
 import "package:args/args.dart";
 
 bool cleanBuild;
@@ skipping 68 matching lines @@
 }
 
 /**
  * Recursively scan the current directory looking for .foo files to process.
  */
 void handleFullBuild() {
   var files = <String>[];
 
   Directory.current.list(recursive: true).listen((entity) {
         if (entity is File) {
-          files.add((entity as File).fullPathSync());
+          files.add((entity as File).resolveSymbolicLinksSync());
         }
       },
       onDone: () => handleChangedFiles(files));
 }
 
 /**
  * Process the given list of changed files.
  */
 void handleChangedFiles(List<String> files) {
   files.forEach(_processFile);
@@ skipping 49 matching lines @@
 }
 
 /**
  * If this file is a generated file (based on the extension), delete it.
  */
 void _maybeClean(File file) {
   if (file.path.endsWith(".foobar")) {
     file.delete();
   }
 }