Remove unused methods in analysis_server.

pkg/analysis_server/lib/src/computer/computer_navigation.dart

Index: pkg/analysis_server/lib/src/computer/computer_navigation.dart
diff --git a/pkg/analysis_server/lib/src/computer/computer_navigation.dart b/pkg/analysis_server/lib/src/computer/computer_navigation.dart
index 5f87bcc873353ca6b2b098df135240389977fd51..c2af2b516a89a4763bd94cc6e8feea1f81f8da90 100644
--- a/pkg/analysis_server/lib/src/computer/computer_navigation.dart
+++ b/pkg/analysis_server/lib/src/computer/computer_navigation.dart
@@ -49,16 +49,6 @@ class DartUnitNavigationComputer {
     _addRegion(offset, length, element);
   }
 
-  void _addRegion_nodeStart_nodeStart(AstNode a, AstNode b, Element element,
-      {bool excludeLastChar: false}) {
-    int offset = a.offset;
-    int length = b.offset - offset;
-    if (excludeLastChar) {
-      length--;
-    }
-    _addRegion(offset, length, element);
-  }
-
   void _addRegion_tokenStart_nodeEnd(Token a, AstNode b, Element element) {
     int offset = a.offset;
     int length = b.end - offset;