Don't expose private type unnecessarily.

src/EditorFeatures/Core/FindUsages/AbstractFindUsagesService.ProgressAdapter.cs

@@ -38,7 +38,7 @@ public Task ReportProgressAsync(int current, int maximum)
         /// <summary>
         /// Forwards IFindReferencesProgress calls to an IFindUsagesContext instance.
         /// </summary>
-        internal class FindReferencesProgressAdapter : ForegroundThreadAffinitizedObject, IStreamingFindReferencesProgress
+        private class FindReferencesProgressAdapter : ForegroundThreadAffinitizedObject, IStreamingFindReferencesProgress
         {
             private readonly Solution _solution;
             private readonly IFindUsagesContext _context;

src/EditorFeatures/Core/FindUsages/AbstractFindUsagesService.cs

@@ -88,11 +88,21 @@ public async Task FindImplementationsAsync(Document document, int position, IFin
                 return null;
             }
 
-            return await FindSymbolReferencesAsync(
+            return await FindSymbolReferencesWorkerAsync(
                 context, symbolAndProject?.symbol, symbolAndProject?.project, cancellationToken).ConfigureAwait(false);
         }
 
-        public static async Task<FindReferencesProgressAdapter> FindSymbolReferencesAsync(
+        /// <summary>
+        /// Public helper that we use from features like ObjectBrowser which start with a symbol
+        /// and want to push all the references to it into the Streaming-Find-References window.
+        /// </summary>
+        public static Task FindSymbolReferencesAsync(
+            IFindUsagesContext context, ISymbol symbol, Project project, CancellationToken cancellationToken)
+        {
+            return FindSymbolReferencesWorkerAsync(context, symbol, project, cancellationToken);
+        }
+
+        private static async Task<FindReferencesProgressAdapter> FindSymbolReferencesWorkerAsync(
             IFindUsagesContext context, ISymbol symbol, Project project, CancellationToken cancellationToken)
         {
             context.SetSearchTitle(string.Format(EditorFeaturesResources._0_references,