TaskScheduler: Change Sequence::PeekTask to Sequence::TakeTask.

base/task_scheduler/task_scheduler_impl.cc

Index: base/task_scheduler/task_scheduler_impl.cc
diff --git a/base/task_scheduler/task_scheduler_impl.cc b/base/task_scheduler/task_scheduler_impl.cc
index 70a71baf7ce45d9ab1ce3632071b863f9cc40b11..af9639b28377a2b531cda549458931fc6de52654 100644
--- a/base/task_scheduler/task_scheduler_impl.cc
+++ b/base/task_scheduler/task_scheduler_impl.cc
@@ -118,12 +118,12 @@ void TaskSchedulerImpl::ReEnqueueSequenceCallback(
   DCHECK(sequence);
 
   const SequenceSortKey sort_key = sequence->GetSortKey();
-  TaskTraits traits(sequence->PeekTask()->traits);
 
-  // Update the priority of |traits| so that the next task in |sequence| runs
-  // with the highest priority in |sequence| as opposed to the next task's
-  // specific priority.
-  traits.WithPriority(sort_key.priority());
+  // The next task in |sequence| should run in a worker pool suited for its
+  // traits, except for the priority which is adjusted to the highest priority
+  // in |sequence|.
+  const TaskTraits traits =
+      sequence->PeekTaskTraits().WithPriority(sort_key.priority());
 
   GetWorkerPoolForTraits(traits)->ReEnqueueSequence(std::move(sequence),
                                                     sort_key);