DO NOT COMMIT -- Very confusing patch...

base/task_scheduler/task_tracker.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/task_scheduler/task_tracker.h"
 
 #include <limits>
 
 #include "base/atomicops.h"
 #include "base/callback.h"
@@ skipping 174 matching lines @@
   const Task* task = sequence->PeekTask();
 
   const TaskShutdownBehavior shutdown_behavior =
       task->traits.shutdown_behavior();
   if (!BeforeRunTask(shutdown_behavior))
     return;
 
   // All tasks run through here and the scheduler itself doesn't use singletons.
   // Therefore, it isn't necessary to reset the singleton allowed bit after
   // running the task.
-  ThreadRestrictions::SetSingletonAllowed(
+  ThreadRestrictions::SetIOAllowed(
       task->traits.shutdown_behavior() !=
       TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN);
 
   {
     // Set up SequenceToken as expected for the scope of the task.
     ScopedSetSequenceTokenForCurrentThread
         scoped_set_sequence_token_for_current_thread(sequence->token());
 
     // Set up TaskRunnerHandle as expected for the scope of the task.
     std::unique_ptr<SequencedTaskRunnerHandle> sequenced_task_runner_handle;
@@ skipping 124 matching lines @@
 
   // This method can only be called after shutdown has started.
   DCHECK(state_->HasShutdownStarted());
   DCHECK(shutdown_event_);
 
   shutdown_event_->Signal();
 }
 
 }  // namespace internal
 }  // namespace base