Use TaskScheduler instead of WorkerPool in file_select_helper.cc.

chrome/browser/file_select_helper.cc

Index: chrome/browser/file_select_helper.cc
diff --git a/chrome/browser/file_select_helper.cc b/chrome/browser/file_select_helper.cc
index 0dec597754601110936646b820112a339b69a2f8..1e3e01e3fa3a4b22ae145d308c6917afd98a1b49 100644
--- a/chrome/browser/file_select_helper.cc
+++ b/chrome/browser/file_select_helper.cc
@@ -16,7 +16,7 @@
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
-#include "base/threading/worker_pool.h"
+#include "base/task_scheduler/post_task.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/platform_util.h"
@@ -250,7 +250,13 @@ void FileSelectHelper::StartNewEnumeration(const base::FilePath& path,
   entry->delegate_.reset(new DirectoryListerDispatchDelegate(this, request_id));
   entry->lister_.reset(new net::DirectoryLister(
       path, net::DirectoryLister::NO_SORT_RECURSIVE, entry->delegate_.get()));
-  if (!entry->lister_->Start(base::WorkerPool::GetTaskRunner(true).get())) {
+  if (!entry->lister_->Start(
+          base::CreateTaskRunnerWithTraits(
+              base::TaskTraits()
+                  .WithShutdownBehavior(
+                      base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN)
+                  .MayBlock())
+              .get())) {
     if (request_id == kFileSelectEnumerationId)
       FileSelectionCanceled(NULL);
     else