Add an AST factory method for fieldDeclaration with all optional named parameters.

pkg/analyzer/lib/src/generated/testing/ast_test_factory.dart

Index: pkg/analyzer/lib/src/generated/testing/ast_test_factory.dart
diff --git a/pkg/analyzer/lib/src/generated/testing/ast_test_factory.dart b/pkg/analyzer/lib/src/generated/testing/ast_test_factory.dart
index 2139d380c56b45b9e2ac161459cc6aa5a3f8aeba..9a5a4589a70e7024793cd30cb922a7d620692ce4 100644
--- a/pkg/analyzer/lib/src/generated/testing/ast_test_factory.dart
+++ b/pkg/analyzer/lib/src/generated/testing/ast_test_factory.dart
@@ -471,12 +471,11 @@ class AstTestFactory {
 
   static FieldDeclaration fieldDeclaration(bool isStatic, Keyword keyword,
           TypeAnnotation type, List<VariableDeclaration> variables) =>
-      astFactory.fieldDeclaration(
-          null,
-          null,
-          isStatic ? TokenFactory.tokenFromKeyword(Keyword.STATIC) : null,
-          variableDeclarationList(keyword, type, variables),
-          TokenFactory.tokenFromType(TokenType.SEMICOLON));
+      astFactory.fieldDeclaration2(
+          staticKeyword:
+              isStatic ? TokenFactory.tokenFromKeyword(Keyword.STATIC) : null,
+          fieldList: variableDeclarationList(keyword, type, variables),
+          semicolon: TokenFactory.tokenFromType(TokenType.SEMICOLON));
 
   static FieldDeclaration fieldDeclaration2(bool isStatic, Keyword keyword,
           List<VariableDeclaration> variables) =>