Revert of Use TaskScheduler instead of WorkerPool in cache_util.cc.

net/disk_cache/cache_util.cc

Index: net/disk_cache/cache_util.cc
diff --git a/net/disk_cache/cache_util.cc b/net/disk_cache/cache_util.cc
index 19e71b8fb39ce7d9dd385d6a229f69b1d9d2a202..51ec95b492c4198d9d822c0fdb4790ebe0f780be 100644
--- a/net/disk_cache/cache_util.cc
+++ b/net/disk_cache/cache_util.cc
@@ -12,8 +12,8 @@
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
-#include "base/task_scheduler/post_task.h"
 #include "base/threading/thread_restrictions.h"
+#include "base/threading/worker_pool.h"
 
 namespace {
 
@@ -136,13 +136,8 @@
     return false;
   }
 
-  base::PostTaskWithTraits(
-      FROM_HERE, base::TaskTraits()
-                     .WithShutdownBehavior(
-                         base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN)
-                     .WithPriority(base::TaskPriority::BACKGROUND)
-                     .MayBlock(),
-      base::Bind(&CleanupCallback, path, name_str));
+  base::WorkerPool::PostTask(
+      FROM_HERE, base::Bind(&CleanupCallback, path, name_str), true);
   return true;
 }