Clean up IOService implementation to be shared between patched and non-patched code.

sdk/lib/io/link.dart

 // Copyright (c) 2013, 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.
 
 part of dart.io;
 
 /**
  * [Link] objects are references to filesystem links.
  *
  */
@@ skipping 131 matching lines @@
   Link get absolute => new Link(_absolutePath);
 
   Future<FileStat> stat() => FileStat.stat(path);
 
   FileStat statSync() => FileStat.statSync(path);
 
   Future<Link> create(String target) {
     if (Platform.operatingSystem == 'windows') {
       target = _makeWindowsLinkTarget(target);
     }
-    return IOService.dispatch(FILE_CREATE_LINK, [path, target])
+    return _IOService.dispatch(_FILE_CREATE_LINK, [path, target])
         .then((response) {
           if (_isErrorResponse(response)) {
             throw _exceptionFromResponse(
                 response, "Cannot create link to target '$target'", path);
           }
           return this;
         });
   }
 
   void createSync(String target) {
@@ skipping 33 matching lines @@
     // Atomically changing a link can be done by creating the new link, with
     // a different name, and using the rename() posix call to move it to
     // the old name atomically.
     return delete().then((_) => create(target));
   }
 
   Future<Link> _delete({bool recursive: false}) {
     if (recursive) {
       return new Directory(path).delete(recursive: true).then((_) => this);
     }
-    return IOService.dispatch(FILE_DELETE_LINK, [path]).then((response) {
+    return _IOService.dispatch(_FILE_DELETE_LINK, [path]).then((response) {
       if (_isErrorResponse(response)) {
         throw _exceptionFromResponse(response, "Cannot delete link", path);
       }
       return this;
     });
   }
 
   void _deleteSync({bool recursive: false}) {
     if (recursive) {
       return new Directory(path).deleteSync(recursive: true);
     }
     var result = _File._deleteLinkNative(path);
     throwIfError(result, "Cannot delete link", path);
   }
 
   Future<Link> rename(String newPath) {
-    return IOService.dispatch(FILE_RENAME_LINK, [path, newPath])
+    return _IOService.dispatch(_FILE_RENAME_LINK, [path, newPath])
         .then((response) {
           if (_isErrorResponse(response)) {
             throw _exceptionFromResponse(
                 response, "Cannot rename link to '$newPath'", path);
           }
           return new Link(newPath);
         });
   }
 
   Link renameSync(String newPath) {
     var result = _File._renameLink(path, newPath);
     throwIfError(result, "Cannot rename link '$path' to '$newPath'");
     return new Link(newPath);
   }
 
   Future<String> target() {
-    return IOService.dispatch(FILE_LINK_TARGET, [path]).then((response) {
+    return _IOService.dispatch(_FILE_LINK_TARGET, [path]).then((response) {
       if (_isErrorResponse(response)) {
         throw _exceptionFromResponse(
             response, "Cannot get target of link", path);
       }
       return response;
     });
   }
 
   String targetSync() {
     var result = _File._linkTarget(path);
@@ skipping 47 matching lines @@
       if (path != null) {
         sb.write(", path = $path");
       }
     }
     return sb.toString();
   }
   final String message;
   final String path;
   final OSError osError;
 }