During thread-pool shutdown, wait for worker threads to shutdown.

runtime/vm/thread_pool_test.cc

Index: runtime/vm/thread_pool_test.cc
===================================================================
--- runtime/vm/thread_pool_test.cc	(revision 45833)
+++ runtime/vm/thread_pool_test.cc	(working copy)
@@ -12,18 +12,6 @@
 DECLARE_FLAG(int, worker_timeout_millis);
 
 
-class ThreadPoolTestPeer {
- public:
-  // When the pool has an exit monitor, workers notify a monitor just
-  // before they exit.  This is only used in tests to make sure that
-  // Shutdown works.
-  static void SetExitMonitor(Monitor* exit_monitor, int* exit_count) {
-    ThreadPool::exit_monitor_ = exit_monitor;
-    ThreadPool::exit_count_ = exit_count;
-  }
-};
-
-
 UNIT_TEST_CASE(ThreadPool_Create) {
   ThreadPool thread_pool;
 }
@@ -101,30 +89,6 @@
 };
 
 
-UNIT_TEST_CASE(ThreadPool_WorkerShutdown) {
-  Monitor exit_sync;
-  int exit_count = 0;
-  MonitorLocker ml(&exit_sync);
-
-  // Set up the ThreadPool so that workers notify before they exit.
-  ThreadPool* thread_pool = new ThreadPool();
-  ThreadPoolTestPeer::SetExitMonitor(&exit_sync, &exit_count);
-
-  // Run a single task.
-  thread_pool->Run(new SleepTask(2));
-
-  // Kill the thread pool.
-  delete thread_pool;
-  thread_pool = NULL;
-
-  // Wait for the workers to terminate.
-  while (exit_count == 0) {
-    ml.Wait();
-  }
-  EXPECT_EQ(1, exit_count);
-}
-
-
 UNIT_TEST_CASE(ThreadPool_WorkerTimeout) {
   // Adjust the worker timeout so that we timeout quickly.
   int saved_timeout = FLAG_worker_timeout_millis;