Put SyntaxFacts methods in the right place.

src/Compilers/CSharp/Portable/Syntax/SyntaxFacts.cs

@@ -486,9 +486,5 @@ internal static bool HasAnyBody(this BaseMethodDeclarationSyntax declaration)
         {
             return (declaration.Body ?? (SyntaxNode)declaration.ExpressionBody) != null;
         }
-
-        internal static bool IsParameterNameXmlElementSyntax(SyntaxNode node)
-            => node.IsKind(XmlElement) &&
-                ((XmlElementSyntax)node).StartTag.Name.ToString() == DocumentationCommentXmlNames.ParameterElementName;
     }
 }

src/Compilers/VisualBasic/Portable/Syntax/SyntaxFacts.vb

@@ -1186,14 +1186,5 @@ Namespace Microsoft.CodeAnalysis.VisualBasic
         Public Shared Function IsReservedTupleElementName(elementName As String) As Boolean
             Return TupleTypeSymbol.IsElementNameReserved(elementName) <> -1
         End Function
-
-        Friend Shared Function IsParameterNameXmlElementSyntax(node As SyntaxNode) As Boolean
-            Dim xmlElement = TryCast(node, XmlElementSyntax)
-            If xmlElement IsNot Nothing Then
-                Return xmlElement.StartTag.Name.ToString() = DocumentationCommentXmlNames.ParameterElementName
-            End If
-
-            Return False
-        End Function
     End Class
 End Namespace

src/Workspaces/CSharp/Portable/LanguageServices/CSharpSyntaxFactsService.cs

@@ -1957,5 +1957,10 @@ public void GetPartsOfCastExpression(SyntaxNode node, out SyntaxNode type, out S
 
         public override SyntaxList<SyntaxNode> GetAttributeLists(SyntaxNode node)
             => CSharpSyntaxGenerator.GetAttributeLists(node);
+
+        public override bool IsParameterNameXmlElementSyntax(SyntaxNode node)
+            => node.IsKind(SyntaxKind.XmlElement) &&
+            ((XmlElementSyntax)node).StartTag.Name.ToString() == DocumentationCommentXmlNames.ParameterElementName;
+
     }
 }

src/Workspaces/Core/Portable/LanguageServices/SyntaxFactsService/AbstractSyntaxFactsService.cs

@@ -589,6 +589,8 @@ protected int GetStartOfNodeExcludingAttributes(SyntaxNode root, SyntaxNode node
 
         public abstract SyntaxList<SyntaxNode> GetAttributeLists(SyntaxNode node);
 
+        public abstract bool IsParameterNameXmlElementSyntax(SyntaxNode node);
+
         public bool IsAwaitKeyword(SyntaxToken token)
             => token.RawKind == SyntaxKinds.AwaitKeyword;
 

src/Workspaces/VisualBasic/Portable/LanguageServices/VisualBasicSyntaxFactsService.vb

@@ -2099,5 +2099,15 @@ Namespace Microsoft.CodeAnalysis.VisualBasic
 
             Return False
         End Function
+
+        Public Overrides Function IsParameterNameXmlElementSyntax(node As SyntaxNode) As Boolean Implements ISyntaxFactsService.IsParameterNameXmlElementSyntax
+
+            Dim xmlElement = TryCast(node, XmlElementSyntax)
+            If xmlElement IsNot Nothing Then
+                Return xmlElement.StartTag.Name.ToString() = DocumentationCommentXmlNames.ParameterElementName
+            End If
+
+            Return False
+        End Function
     End Class
 End Namespace