Update the plugin API

pkg/analyzer_plugin/lib/utilities/completion/inherited_reference_contributor.dart

 // Copyright (c) 2017, 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:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_resolution_map.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
@@ skipping 23 matching lines @@
   ResourceProvider resourceProvider;
 
   /**
    * Plugin contributors should primarily overload this function.
    * Should more parameters be needed for autocompletion needs, the
    * overloaded function should define those parameters and
    * call on `computeSuggestionsForClass`.
    */
   @override
   Future<Null> computeSuggestions(
-      CompletionRequest request, CompletionCollector collector) async {
+      DartCompletionRequest request, CompletionCollector collector) async {
     CompletionTarget target =
         new CompletionTarget.forOffset(request.result.unit, request.offset);
     OpType optype = new OpType.forCompletion(target, request.offset);
     if (!optype.includeIdentifiers) {
       return;
     }
     ClassDeclaration classDecl = _enclosingClass(target);
     if (classDecl == null || classDecl.element == null) {
       return;
     }
     containingLibrary = request.result.libraryElement;
     _computeSuggestionsForClass2(collector, target,
         resolutionMap.elementDeclaredByClassDeclaration(classDecl), optype);
   }
 
   /**
    * Clients should not overload this function.
    */
   Future<Null> computeSuggestionsForClass(
-    CompletionRequest request,
+    DartCompletionRequest request,
     CompletionCollector collector,
     ClassElement classElement, {
     AstNode entryPoint,
     bool skipChildClass,
     CompletionTarget target,
     OpType optype,
   }) async {
     target ??= new CompletionTarget.forOffset(
         request.result.unit, request.offset,
         entryPoint: entryPoint);
@@ skipping 84 matching lines @@
       if (node is FieldDeclaration) {
         if (node.isStatic) {
           return null;
         }
       }
       node = node.parent;
     }
     return null;
   }
 }