Transition analyzer and analysis_server to new astFactory; remove old AST factory methods.

pkg/analysis_server/lib/src/services/completion/dart/completion_manager.dart

Index: pkg/analysis_server/lib/src/services/completion/dart/completion_manager.dart
diff --git a/pkg/analysis_server/lib/src/services/completion/dart/completion_manager.dart b/pkg/analysis_server/lib/src/services/completion/dart/completion_manager.dart
index e00ec2a81a5be62641f16e811ae38cab38212267..26a9af5c403832e3a88932ff2ccc955f2848742a 100644
--- a/pkg/analysis_server/lib/src/services/completion/dart/completion_manager.dart
+++ b/pkg/analysis_server/lib/src/services/completion/dart/completion_manager.dart
@@ -19,6 +19,7 @@ import 'package:analysis_server/src/services/completion/dart/contribution_sorter
 import 'package:analysis_server/src/services/completion/dart/optype.dart';
 import 'package:analysis_server/src/services/search/search_engine.dart';
 import 'package:analyzer/dart/ast/ast.dart';
+import 'package:analyzer/dart/ast/standard_ast_factory.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
@@ -516,7 +517,8 @@ class ReplacementRange {
         }
       }
       if (token is StringToken) {
-        SimpleStringLiteral uri = new SimpleStringLiteral(token, token.lexeme);
+        SimpleStringLiteral uri =
+            astFactory.simpleStringLiteral(token, token.lexeme);
         Keyword keyword = token.previous?.keyword;
         if (keyword == Keyword.IMPORT ||
             keyword == Keyword.EXPORT ||