Revert "Add NormalFormalParameter.covariantKeyword setter and factory parameter."

pkg/analyzer/lib/src/dart/ast/ast_factory.dart

Index: pkg/analyzer/lib/src/dart/ast/ast_factory.dart
diff --git a/pkg/analyzer/lib/src/dart/ast/ast_factory.dart b/pkg/analyzer/lib/src/dart/ast/ast_factory.dart
index 03ed9dfcb9cd24929121c77e42caa9966d3b6d2f..482ae0161c3fd87e9797c5a9f3904c25ff169027 100644
--- a/pkg/analyzer/lib/src/dart/ast/ast_factory.dart
+++ b/pkg/analyzer/lib/src/dart/ast/ast_factory.dart
@@ -366,7 +366,6 @@ class AstFactoryImpl extends AstFactory {
   FieldFormalParameter fieldFormalParameter(
           Comment comment,
           List<Annotation> metadata,
-          Token covariantKeyword,
           Token keyword,
           TypeAnnotation type,
           Token thisKeyword,
@@ -374,8 +373,8 @@ class AstFactoryImpl extends AstFactory {
           SimpleIdentifier identifier,
           TypeParameterList typeParameters,
           FormalParameterList parameters) =>
-      new FieldFormalParameterImpl(comment, metadata, covariantKeyword, keyword,
-          type, thisKeyword, period, identifier, typeParameters, parameters);
+      new FieldFormalParameterImpl(comment, metadata, keyword, type,
+          thisKeyword, period, identifier, typeParameters, parameters);
 
   @override
   ForEachStatement forEachStatementWithDeclaration(
@@ -496,14 +495,13 @@ class AstFactoryImpl extends AstFactory {
   FunctionTypedFormalParameter functionTypedFormalParameter(
           Comment comment,
           List<Annotation> metadata,
-          Token covariantKeyword,
           TypeAnnotation returnType,
           SimpleIdentifier identifier,
           TypeParameterList typeParameters,
           FormalParameterList parameters,
           {Token question: null}) =>
-      new FunctionTypedFormalParameterImpl(comment, metadata, covariantKeyword,
-          returnType, identifier, typeParameters, parameters, question);
+      new FunctionTypedFormalParameterImpl(comment, metadata, returnType,
+          identifier, typeParameters, parameters, question);
 
   @override
   GenericFunctionType genericFunctionType(
@@ -776,12 +774,11 @@ class AstFactoryImpl extends AstFactory {
   SimpleFormalParameter simpleFormalParameter(
           Comment comment,
           List<Annotation> metadata,
-          Token covariantKeyword,
           Token keyword,
           TypeAnnotation type,
           SimpleIdentifier identifier) =>
       new SimpleFormalParameterImpl(
-          comment, metadata, covariantKeyword, keyword, type, identifier);
+          comment, metadata, keyword, type, identifier);
 
   @override
   SimpleIdentifier simpleIdentifier(Token token, {bool isDeclaration: false}) {