Revert of Tests: Simplify SequencedWorkerPoolOwner, call Shutdown on destructor.

base/test/sequenced_worker_pool_owner.cc

Index: base/test/sequenced_worker_pool_owner.cc
diff --git a/base/test/sequenced_worker_pool_owner.cc b/base/test/sequenced_worker_pool_owner.cc
index 37bad2b29d25c5e5084cd9e6c69ec87da416d45a..b0d8b7a1adb084d0fcd78c037acfacd91c643944 100644
--- a/base/test/sequenced_worker_pool_owner.cc
+++ b/base/test/sequenced_worker_pool_owner.cc
@@ -18,11 +18,8 @@
       has_work_call_count_(0) {}
 
 SequencedWorkerPoolOwner::~SequencedWorkerPoolOwner() {
-  pool_->Shutdown();
   pool_ = NULL;
-
-  // Spin the current message loop until SWP destruction verified in OnDestruct.
-  exit_loop_.Run();
+  MessageLoop::current()->Run();
 }
 
 const scoped_refptr<SequencedWorkerPool>& SequencedWorkerPoolOwner::pool() {
@@ -54,7 +51,8 @@
 }
 
 void SequencedWorkerPoolOwner::OnDestruct() {
-  constructor_message_loop_->PostTask(FROM_HERE, exit_loop_.QuitClosure());
+  constructor_message_loop_->task_runner()->PostTask(
+      FROM_HERE, constructor_message_loop_->QuitWhenIdleClosure());
 }
 
 }  // namespace base