Update edit.importElements response data to support part files

pkg/analysis_server/lib/src/edit/edit_domain.dart

 // Copyright (c) 2014, 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.
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/edit/assist/assist_core.dart';
 import 'package:analysis_server/plugin/edit/assist/assist_dart.dart';
 import 'package:analysis_server/plugin/edit/fix/fix_core.dart';
 import 'package:analysis_server/plugin/edit/fix/fix_dart.dart';
@@ skipping 388 matching lines @@
     }
     //
     // Compute the edits required to import the required elements.
     //
     ImportElementsComputer computer =
         new ImportElementsComputer(server.resourceProvider, result);
     SourceChange change = await computer.createEdits(params.elements);
     //
     // Send the response.
     //
-    server.sendResponse(new EditImportElementsResult(change.edits[0].edits)
-        .toResponse(request.id));
+    server.sendResponse(
+        new EditImportElementsResult(change.edits[0]).toResponse(request.id));
   }
 
   Future isPostfixCompletionApplicable(Request request) async {
     var params = new EditGetPostfixCompletionParams.fromRequest(request);
     bool value = false;
 
     AnalysisResult result = await server.getAnalysisResult(params.file);
     if (result != null) {
       CompilationUnit unit = result.unit;
       CompilationUnitElement unitElement =
@@ skipping 637 matching lines @@
     }
     return new RefactoringStatus();
   }
 }
 
 /**
  * [_RefactoringManager] throws instances of this class internally to stop
  * processing in a manager that was reset.
  */
 class _ResetError {}