Remove unused parameter. (#16341)

src/Compilers/CSharp/Portable/Symbols/Source/ModifierUtils.cs

@@ -13,10 +13,9 @@ internal static class ModifierUtils
             DeclarationModifiers allowedModifiers,
             Location errorLocation,
             DiagnosticBag diagnostics,
-            out bool modifierErrors,
-            bool ignoreParameterModifiers = false)
+            out bool modifierErrors)
         {
-            var result = modifiers.ToDeclarationModifiers(ignoreParameterModifiers);
+            var result = modifiers.ToDeclarationModifiers();
             result = CheckModifiers(result, allowedModifiers, errorLocation, diagnostics, out modifierErrors);
 
             if ((result & DeclarationModifiers.AccessibilityMask) == 0)
@@ -110,7 +109,7 @@ private static string ConvertSingleModifierToSyntaxText(DeclarationModifiers mod
             }
         }
 
-        private static DeclarationModifiers ToDeclarationModifier(SyntaxKind kind, bool ignoreParameterModifiers)
+        private static DeclarationModifiers ToDeclarationModifier(SyntaxKind kind)
         {
             switch (kind)
             {
@@ -150,27 +149,18 @@ private static DeclarationModifiers ToDeclarationModifier(SyntaxKind kind, bool
                     return DeclarationModifiers.Fixed;
                 case SyntaxKind.VolatileKeyword:
                     return DeclarationModifiers.Volatile;
-                case SyntaxKind.ThisKeyword:
-                case SyntaxKind.RefKeyword:
-                case SyntaxKind.OutKeyword:
-                case SyntaxKind.ParamsKeyword:
-                    if (ignoreParameterModifiers)
-                    {
-                        return DeclarationModifiers.None;
-                    }
-                    goto default;
                 default:
                     throw ExceptionUtilities.UnexpectedValue(kind);
             }
         }
 
-        public static DeclarationModifiers ToDeclarationModifiers(this SyntaxTokenList modifiers, bool ignoreParameterModifiers = false)
+        public static DeclarationModifiers ToDeclarationModifiers(this SyntaxTokenList modifiers)
         {
             var result = DeclarationModifiers.None;
 
             foreach (var modifier in modifiers)
             {
-                DeclarationModifiers one = ToDeclarationModifier(modifier.ContextualKind(), ignoreParameterModifiers);
+                DeclarationModifiers one = ToDeclarationModifier(modifier.ContextualKind());
                 result |= one;
             }