Remove async modifier from outlines

pkg/front_end/lib/src/fasta/kernel/kernel_library_builder.dart

Index: pkg/front_end/lib/src/fasta/kernel/kernel_library_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/kernel/kernel_library_builder.dart b/pkg/front_end/lib/src/fasta/kernel/kernel_library_builder.dart
index 7b39f2baad1768916a3a764f25448ba2b750d345..56ac314277c00f00c2af016ce172e948a39d4632 100644
--- a/pkg/front_end/lib/src/fasta/kernel/kernel_library_builder.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/kernel_library_builder.dart
@@ -501,7 +501,6 @@ class KernelLibraryBuilder
       String name,
       List<TypeVariableBuilder> typeVariables,
       List<FormalParameterBuilder> formals,
-      AsyncMarker asyncModifier,
       ProcedureKind kind,
       int charOffset,
       int charOpenParenOffset,
@@ -536,7 +535,6 @@ class KernelLibraryBuilder
           name,
           typeVariables,
           formals,
-          asyncModifier,
           kind,
           this,
           charOffset,
@@ -555,7 +553,6 @@ class KernelLibraryBuilder
       int modifiers,
       ConstructorReferenceBuilder constructorNameReference,
       List<FormalParameterBuilder> formals,
-      AsyncMarker asyncModifier,
       ConstructorReferenceBuilder redirectionTarget,
       int charOffset,
       int charOpenParenOffset,
@@ -578,7 +575,6 @@ class KernelLibraryBuilder
         name,
         <TypeVariableBuilder>[],
         formals,
-        asyncModifier,
         ProcedureKind.Factory,
         this,
         charOffset,