Make method private.

src/Workspaces/Core/Portable/Workspace/Host/TaskScheduler/WorkspaceTaskSchedulerFactory.WorkspaceTaskQueue.cs

@@ -20,7 +20,7 @@ public WorkspaceTaskQueue(WorkspaceTaskSchedulerFactory factory, TaskScheduler t
                 _queue = new SimpleTaskQueue(taskScheduler);
             }
 
-            public T3 ScheduleTask<T1, T2, T3>(Func<T1, T2, T3> taskScheduler, string taskName, T1 arg1, T2 arg2) where T3 : Task
+            private T3 ScheduleTask<T1, T2, T3>(Func<T1, T2, T3> taskScheduler, string taskName, T1 arg1, T2 arg2) where T3 : Task
             {
                 taskName = taskName ?? GetType().Name + ".Task";
                 var asyncToken = _factory.BeginAsyncOperation(taskName);
@@ -52,4 +52,4 @@ public Task<T> ScheduleTask<T>(Func<Task<T>> taskFunc, string taskName, Cancella
             }
         }
     }
-}
+}
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