TaskScheduler: Set the IO allowed bit in TaskTracker::RunTask().

base/task_scheduler/scheduler_worker_pool_params.h

Index: base/task_scheduler/scheduler_worker_pool_params.h
diff --git a/base/task_scheduler/scheduler_worker_pool_params.h b/base/task_scheduler/scheduler_worker_pool_params.h
index c33392afd061c0d6c22d12e262111430bae4b2b4..f3cd20fd7a3be7315b6ad972dfee2426ba5d73de 100644
--- a/base/task_scheduler/scheduler_worker_pool_params.h
+++ b/base/task_scheduler/scheduler_worker_pool_params.h
@@ -16,11 +16,6 @@ class TimeDelta;
 
 class BASE_EXPORT SchedulerWorkerPoolParams final {
  public:
-  enum class IORestriction {
-    ALLOWED,
-    DISALLOWED,
-  };
-
   enum class StandbyThreadPolicy {
     // Create threads as needed on demand, reclaimed as necessary.
     LAZY,
@@ -34,13 +29,11 @@ class BASE_EXPORT SchedulerWorkerPoolParams final {
   // ("TaskScheduler." + histogram name + "." + |name| + extra suffixes). The
   // pool will contain up to |max_threads|. |priority_hint| is the preferred
   // thread priority; the actual thread priority depends on shutdown state and
-  // platform capabilities. |io_restriction| indicates whether Tasks on the pool
-  // are allowed to make I/O calls. |suggested_reclaim_time| sets a suggestion
-  // on when to reclaim idle threads. The pool is free to ignore this value for
+  // platform capabilities. |suggested_reclaim_time| sets a suggestion on when
+  // to reclaim idle threads. The pool is free to ignore this value for
   // performance or correctness reasons.
   SchedulerWorkerPoolParams(const std::string& name,
                             ThreadPriority priority_hint,
-                            IORestriction io_restriction,
                             StandbyThreadPolicy standby_thread_policy,
                             int max_threads,
                             const TimeDelta& suggested_reclaim_time);
@@ -49,7 +42,6 @@ class BASE_EXPORT SchedulerWorkerPoolParams final {
 
   const std::string& name() const { return name_; }
   ThreadPriority priority_hint() const { return priority_hint_; }
-  IORestriction io_restriction() const { return io_restriction_; }
   StandbyThreadPolicy standby_thread_policy() const {
     return standby_thread_policy_;
   }
@@ -61,7 +53,6 @@ class BASE_EXPORT SchedulerWorkerPoolParams final {
  private:
   std::string name_;
   ThreadPriority priority_hint_;
-  IORestriction io_restriction_;
   StandbyThreadPolicy standby_thread_policy_;
   size_t max_threads_;
   TimeDelta suggested_reclaim_time_;