Allow SequencedTaskRunnerHandle::Get() while running unsequenced tasks.

chromeos/accelerometer/accelerometer_reader.cc

Index: chromeos/accelerometer/accelerometer_reader.cc
diff --git a/chromeos/accelerometer/accelerometer_reader.cc b/chromeos/accelerometer/accelerometer_reader.cc
index 4fad1defbec3a32f99be70a7abbb4e6d4a5afcb3..d91efce0c05f61ab0e3ed3a269991a681cc3746e 100644
--- a/chromeos/accelerometer/accelerometer_reader.cc
+++ b/chromeos/accelerometer/accelerometer_reader.cc
@@ -223,8 +223,7 @@ AccelerometerFileReader::AccelerometerFileReader()
 
 void AccelerometerFileReader::Initialize(
     scoped_refptr<base::SequencedTaskRunner> sequenced_task_runner) {
-  DCHECK(
-      base::SequencedWorkerPool::GetSequenceTokenForCurrentThread().IsValid());
+  DCHECK(sequenced_task_runner->RunsTasksOnCurrentThread());
   task_runner_ = sequenced_task_runner;
 
   // Check for accelerometer symlink which will be created by the udev rules