Convert PsesReferencesHandler to inherit ReferencesHandlerBase

Author: andyleejordan

src/PowerShellEditorServices/Services/TextDocument/Handlers/ReferencesHandler.cs

@@ -18,12 +18,11 @@
 
 namespace Microsoft.PowerShell.EditorServices.Handlers
 {
-    class PsesReferencesHandler : IReferencesHandler
+    class PsesReferencesHandler : ReferencesHandlerBase
     {
         private readonly ILogger _logger;
         private readonly SymbolsService _symbolsService;
         private readonly WorkspaceService _workspaceService;
-        private ReferenceCapability _capability;
 
         public PsesReferencesHandler(ILoggerFactory factory, SymbolsService symbolsService, WorkspaceService workspaceService)
         {
@@ -32,15 +31,12 @@ public PsesReferencesHandler(ILoggerFactory factory, SymbolsService symbolsServi
             _workspaceService = workspaceService;
         }
 
-        public ReferenceRegistrationOptions GetRegistrationOptions()
+        protected override ReferenceRegistrationOptions CreateRegistrationOptions(ReferenceCapability capability, ClientCapabilities clientCapabilities) => new ReferenceRegistrationOptions
         {
-            return new ReferenceRegistrationOptions
-            {
-                DocumentSelector = LspUtils.PowerShellDocumentSelector
-            };
-        }
+            DocumentSelector = LspUtils.PowerShellDocumentSelector
+        };
 
-        public Task<LocationContainer> Handle(ReferenceParams request, CancellationToken cancellationToken)
+        public override Task<LocationContainer> Handle(ReferenceParams request, CancellationToken cancellationToken)
         {
             ScriptFile scriptFile = _workspaceService.GetFile(request.TextDocument.Uri);
 
@@ -73,11 +69,6 @@ public Task<LocationContainer> Handle(ReferenceParams request, CancellationToken
             return Task.FromResult(new LocationContainer(locations));
         }
 
-        public void SetCapability(ReferenceCapability capability)
-        {
-            _capability = capability;
-        }
-
         private static Range GetRangeFromScriptRegion(ScriptRegion scriptRegion)
         {
             return new Range