remove redundant CompletionRequestImpl class

pkg/analysis_server/lib/src/services/completion/dart/completion_manager.dart

 // Copyright (c) 2015, 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 services.completion.dart.manager;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/analysis_server.dart';
@@ skipping 77 matching lines @@
   /**
    * Initialize a newly created completion request based on the given request.
    */
   factory DartCompletionRequestImpl.forRequest(CompletionRequest request) {
     return new DartCompletionRequestImpl._(request.server, request.context,
         request.resourceProvider, request.source, request.offset);
   }
 
   DartCompletionRequestImpl._(AnalysisServer server, AnalysisContext context,
       ResourceProvider resourceProvider, Source source, int offset)
-      : super(server, context, resourceProvider, source, offset);
+      : super(server, context, source, offset);
 
   @override
   Future<CompilationUnit> resolveDeclarationsInScope() async {
     CompilationUnit unit = target.unit;
     if (_haveResolveDeclarationsInScope) {
       return unit;
     }
 
     // Determine the library source
     Source librarySource;
@@ skipping 31 matching lines @@
 
   @override
   CompletionTarget get target {
     if (_target == null) {
       CompilationUnit unit = context.computeResult(source, PARSED_UNIT);
       _target = new CompletionTarget.forOffset(unit, offset);
     }
     return _target;
   }
 }