Revert of Revert "Allow SequencedTaskRunnerHandle::Get() while running unsequenced tasks."

base/threading/sequenced_task_runner_handle_unittest.cc

Index: base/threading/sequenced_task_runner_handle_unittest.cc
diff --git a/base/threading/sequenced_task_runner_handle_unittest.cc b/base/threading/sequenced_task_runner_handle_unittest.cc
index a9e94f273bce4d1eece53eb62e496f5c989a61a5..381aa51d77a3d273a9e69fe1a6d65b3a2ef6ce6d 100644
--- a/base/threading/sequenced_task_runner_handle_unittest.cc
+++ b/base/threading/sequenced_task_runner_handle_unittest.cc
@@ -27,9 +27,6 @@
 
 class SequencedTaskRunnerHandleTest : public ::testing::Test {
  protected:
-  // Verifies that the context it runs on has a SequencedTaskRunnerHandle
-  // and that posting to it results in the posted task running in that same
-  // context (sequence). Runs |callback| on sequence when done.
   static void VerifyCurrentSequencedTaskRunner(const Closure& callback) {
     ASSERT_TRUE(SequencedTaskRunnerHandle::IsSet());
     scoped_refptr<SequencedTaskRunner> task_runner =
@@ -43,13 +40,6 @@
         FROM_HERE,
         base::Bind(&SequencedTaskRunnerHandleTest::CheckValidSequence,
                    base::Passed(&sequence_checker), callback));
-  }
-
-  // Verifies that there is no SequencedTaskRunnerHandle in the context it runs.
-  // Runs |callback| when done.
-  static void VerifyNoSequencedTaskRunner(const Closure& callback) {
-    ASSERT_FALSE(SequencedTaskRunnerHandle::IsSet());
-    callback.Run();
   }
 
  private:
@@ -81,9 +71,10 @@
           &SequencedTaskRunnerHandleTest::VerifyCurrentSequencedTaskRunner,
           base::Bind(&WaitableEvent::Signal, base::Unretained(&event))));
   event.Wait();
+  owner.pool()->Shutdown();
 }
 
-TEST_F(SequencedTaskRunnerHandleTest, NoHandleFromUnsequencedTask) {
+TEST_F(SequencedTaskRunnerHandleTest, FromUnsequencedTask) {
   // Wrap the SequencedWorkerPool to avoid leaks due to its asynchronous
   // destruction.
   SequencedWorkerPoolOwner owner(3, "Test");
@@ -92,7 +83,7 @@
   owner.pool()->PostWorkerTask(
       FROM_HERE,
       base::Bind(
-          &SequencedTaskRunnerHandleTest::VerifyNoSequencedTaskRunner,
+          &SequencedTaskRunnerHandleTest::VerifyCurrentSequencedTaskRunner,
           base::Bind(&WaitableEvent::Signal, base::Unretained(&event))));
   event.Wait();
 }