dart:developer service extension fixes

sdk/lib/io/file_impl.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;
 
 // Read the file in blocks of size 64k.
 const int _BLOCK_SIZE = 64 * 1024;
 
 
@@ skipping 577 matching lines @@
   }
 
   external static int _getFD(int id);
 
   _maybeConnectHandler() {
     if (!_connectedResourceHandler) {
       // TODO(ricow): we probably need set these in some initialization code.
       // We need to make sure that these are always awailable from the
       // observatory even if no files (or sockets for the socket ones) are
       // open.
-      registerExtension('__getOpenFiles',
+      registerExtension('ext.dart.io.getOpenFiles',
                         _FileResourceInfo.getOpenFiles);
-      registerExtension('__getFileByID',
+      registerExtension('ext.dart.io.getFileByID',
                         _FileResourceInfo.getFileInfoMapByID);
       _connectedResourceHandler = true;
     }
   }
 
   Future<RandomAccessFile> close() {
     return _dispatch(_FILE_CLOSE, [_id], markClosed: true).then((result) {
       if (result != -1) {
         _id = result;
         _maybePerformCleanup();
@@ skipping 408 matching lines @@
   void _checkAvailable() {
     if (_asyncDispatched) {
       throw new FileSystemException("An async operation is currently pending",
                                     path);
     }
     if (closed) {
       throw new FileSystemException("File closed", path);
     }
   }
 }