remove old completion API

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/provisional/completion/completion_core.dart'
@@ skipping 70 matching lines @@
     // Adjust suggestion relevance before returning
     List<CompletionSuggestion> suggestions = suggestionMap.values.toList();
     await contributionSorter.sort(dartRequest, suggestions);
     return suggestions;
   }
 }
 
 /**
  * The information about a requested list of completions within a Dart file.
  */
-class DartCompletionRequestImpl extends CompletionRequestImpl
-    implements DartCompletionRequest {
-  /**
-   * The [LibraryElement] representing dart:core
-   */
-  LibraryElement _coreLib;
+class DartCompletionRequestImpl implements DartCompletionRequest {
+  @override
+  final AnalysisContext context;
 
-  /**
-   * The [DartType] for Object in dart:core
-   */
-  InterfaceType _objectType;
+  @override
+  final Source source;
+
+  @override
+  final int offset;
 
   @override
   Expression dotTarget;
 
   @override
   Source librarySource;
 
-  OpType _opType;
+  @override
+  final ResourceProvider resourceProvider;
+
+  @override
+  final SearchEngine searchEngine;
 
   @override
   CompletionTarget target;
 
+  /**
+   * The [LibraryElement] representing dart:core
+   */
+  LibraryElement _coreLib;
+
+  /**
+   * The [DartType] for Object in dart:core
+   */
+  InterfaceType _objectType;
+
+  OpType _opType;
+
   DartCompletionRequestImpl._(
-      AnalysisContext context,
-      ResourceProvider resourceProvider,
-      SearchEngine searchEngine,
+      this.context,
+      this.resourceProvider,
+      this.searchEngine,
       this.librarySource,
-      Source source,
-      int offset,
-      CompilationUnit unit)
-      : super(context, resourceProvider, searchEngine, source, offset) {
+      this.source,
+      this.offset,
+      CompilationUnit unit) {
     _updateTargets(unit);
   }
 
   @override
   LibraryElement get coreLib {
     if (_coreLib == null) {
       Source coreUri = context.sourceFactory.forUri('dart:core');
       _coreLib = context.computeLibraryElement(coreUri);
     }
     return _coreLib;
@@ skipping 214 matching lines @@
               // Replacement range for import URI
               return new ReplacementRange(start, end - start);
             }
           }
         }
       }
     }
     return new ReplacementRange(requestOffset, 0);
   }
 }