Actually delete PumpingWait

Now that the internal dependencies have been removed we can delete the PumpingWait methods.

src/EditorFeatures/TestUtilities/Async/WaitHelper.cs

@@ -13,67 +13,10 @@ namespace Roslyn.Test.Utilities
 {
     public static class WaitHelper
     {
-        /// <summary>
-        /// This is a hueristic for checking to see if we are in a deadlock state because
-        /// we are waiting on a Task that may be in the StaTaskScheduler queue from the 
-        /// main thread.
-        /// </summary>
-        /// <param name="tasks"></param>
-        private static void CheckForStaDeadlockInPumpingWait(IEnumerable<Task> tasks)
-        {
-            var sta = StaTaskScheduler.DefaultSta;
-            Debug.Assert(sta.Threads.Length == 1);
-
-            if (Thread.CurrentThread != sta.Threads[0])
-            {
-                return;
-            }
-
-            if (tasks.Any(x => x.Status == TaskStatus.WaitingForActivation) && sta.IsAnyQueued())
-            {
-                throw new InvalidOperationException("PumingWait is likely in a deadlock");
-            }
-        }
-
         public static void WaitForDispatchedOperationsToComplete(DispatcherPriority priority)
         {
             Action action = delegate { };
             new FrameworkElement().Dispatcher.Invoke(action, priority);
         }
-
-        public static void PumpingWait(this Task task)
-        {
-            PumpingWaitAll(new[] { task });
-        }
-
-        public static T PumpingWaitResult<T>(this Task<T> task)
-        {
-            PumpingWait(task);
-            return task.Result;
-        }
-
-        public static void PumpingWaitAll(this IEnumerable<Task> tasks)
-        {
-            var smallTimeout = TimeSpan.FromMilliseconds(10);
-            var taskArray = tasks.ToArray();
-            var done = false;
-            while (!done)
-            {
-                done = Task.WaitAll(taskArray, smallTimeout);
-                if (!done)
-                {
-                    WaitForDispatchedOperationsToComplete(DispatcherPriority.ApplicationIdle);
-                    CheckForStaDeadlockInPumpingWait(tasks);
-                }
-            }
-
-            foreach (var task in tasks)
-            {
-                if (task.Exception != null)
-                {
-                    throw task.Exception;
-                }
-            }
-        }
     }
 }
\ No newline at end of file

src/Test/Diagnostics/TestingOnly_WaitingService.cs

@@ -118,10 +118,5 @@ public void EnableActiveTokenTracking(bool enable)
                 waiter.Value.TrackActiveTokens = enable;
             }
         }
-
-        public void PumpingWait(Task task)
-        {
-            task.PumpingWait();
-        }
     }
 }