Remove most of the remaining references to AnalysisContext

pkg/analysis_server/lib/plugin/analysis/navigation/navigation_core.dart

Index: pkg/analysis_server/lib/plugin/analysis/navigation/navigation_core.dart
diff --git a/pkg/analysis_server/lib/plugin/analysis/navigation/navigation_core.dart b/pkg/analysis_server/lib/plugin/analysis/navigation/navigation_core.dart
index 5a1c18dca03580f03cd7c9c636a79564d1b30766..6e0cc40d67cfa0250ef62bfea262990e5479d02c 100644
--- a/pkg/analysis_server/lib/plugin/analysis/navigation/navigation_core.dart
+++ b/pkg/analysis_server/lib/plugin/analysis/navigation/navigation_core.dart
@@ -2,13 +2,11 @@
 // 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:analyzer/src/generated/engine.dart' show AnalysisContext;
-import 'package:analyzer/src/generated/source.dart' show Source;
 import 'package:analyzer_plugin/protocol/protocol_common.dart'
     show ElementKind, Location;
 
 /**
- * An object that [NavigationContributor]s use to record navigation regions.
+ * An object used to record navigation regions.
  *
  * Clients may not extend, implement or mix-in this class.
  */
@@ -20,18 +18,3 @@ abstract class NavigationCollector {
   void addRegion(
       int offset, int length, ElementKind targetKind, Location targetLocation);
 }
-
-/**
- * An object used to produce navigation regions.
- *
- * Clients may implement this class when implementing plugins.
- */
-abstract class NavigationContributor {
-  /**
-   * Contribute navigation regions for a subset of the content of the given
-   * [source] into the given [collector]. The subset is specified by the
-   * [offset] and [length]. The [context] can be used to access analysis results.
-   */
-  void computeNavigation(NavigationCollector collector, AnalysisContext context,
-      Source source, int offset, int length);
-}