Remove most of the remaining references to AnalysisContext

pkg/analysis_server/lib/src/domains/analysis/navigation_dart.dart

Index: pkg/analysis_server/lib/src/domains/analysis/navigation_dart.dart
diff --git a/pkg/analysis_server/lib/src/domains/analysis/navigation_dart.dart b/pkg/analysis_server/lib/src/domains/analysis/navigation_dart.dart
index 2e708e379d7372eb4a1e1bc9cd444c90c6336d18..c79284ebb87094821d31aa68314db6432db2f342 100644
--- a/pkg/analysis_server/lib/src/domains/analysis/navigation_dart.dart
+++ b/pkg/analysis_server/lib/src/domains/analysis/navigation_dart.dart
@@ -11,7 +11,6 @@ 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,
@@ -40,24 +39,6 @@ AstNode _getNodeForRange(CompilationUnit unit, int offset, int length) {
 }
 
 /**
- * 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 {