Revert "Change some platform libraries to use `part of URI`."

sdk/lib/vmservice/devfs.dart

 // Copyright (c) 2016, 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:_vmservice";
+part of dart._vmservice;
 
 String _encodeDevFSDisabledError(Message message) {
   return encodeRpcError(message, kFeatureDisabled,
       details: "DevFS is not supported by this Dart implementation");
 }
 
 String _encodeFileSystemAlreadyExistsError(Message message, String fsName) {
   return encodeRpcError(message, kFileSystemAlreadyExists,
       details: "${message.method}: file system '${fsName}' already exists");
 }
@@ skipping 374 matching lines @@
     }
     var fileList = await listFiles(fs.uri);
     // Remove any url-encoding in the filenames.
     for (int i = 0; i < fileList.length; i++) {
       fileList[i]['name'] = Uri.decodeFull(fileList[i]['name']);
     }
     var result = {'type': 'FSFileList', 'files': fileList};
     return encodeResult(message, result);
   }
 }