Remove most of the remaining references to AnalysisContext

pkg/analysis_server/lib/src/domains/analysis/navigation_dart.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.
 
 import 'package:analysis_server/plugin/analysis/navigation/navigation_core.dart';
 import 'package:analysis_server/src/protocol_server.dart' as protocol;
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/src/dart/ast/utilities.dart';
 import 'package:analyzer/src/dart/element/element.dart';
-import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 
 NavigationCollector computeDartNavigation(NavigationCollector collector,
     CompilationUnit unit, int offset, int length) {
   _DartNavigationCollector dartCollector =
       new _DartNavigationCollector(collector);
   _DartNavigationComputerVisitor visitor =
       new _DartNavigationComputerVisitor(dartCollector);
   if (offset == null || length == null) {
     unit.accept(visitor);
   } else {
     AstNode node = _getNodeForRange(unit, offset, length);
     node?.accept(visitor);
   }
   return collector;
 }
 
 AstNode _getNodeForRange(CompilationUnit unit, int offset, int length) {
   AstNode node = new NodeLocator(offset, offset + length).searchWithin(unit);
   for (AstNode n = node; n != null; n = n.parent) {
     if (n is Directive) {
       return n;
     }
   }
   return node;
 }
 
 /**
- * A computer for navigation regions in a Dart [CompilationUnit].
- */
-class DartNavigationComputer implements NavigationContributor {
-  @override
-  void computeNavigation(NavigationCollector collector, AnalysisContext context,
-      Source source, int offset, int length) {
-    List<Source> libraries = context.getLibrariesContaining(source);
-    if (libraries.isNotEmpty) {
-      CompilationUnit unit =
-          context.getResolvedCompilationUnit2(source, libraries.first);
-      if (unit != null) {
-        computeDartNavigation(collector, unit, offset, length);
-      }
-    }
-  }
-}
-
-/**
  * A Dart specific wrapper around [NavigationCollector].
  */
 class _DartNavigationCollector {
   final NavigationCollector collector;
 
   _DartNavigationCollector(this.collector);
 
   void _addRegion(int offset, int length, Element element) {
     if (element is FieldFormalParameterElement) {
       element = (element as FieldFormalParameterElement).field;
@@ skipping 299 matching lines @@
    */
   void _addUriDirectiveRegion(UriBasedDirective node, Element element) {
     if (element != null) {
       Source source = element.source;
       if (element.context.exists(source)) {
         computer._addRegionForNode(node.uri, element);
       }
     }
   }
 }