CrOS: resourced should re-post to the correct sequence

When resourced is not up yet we reschedule our set memory
margins dbus message to 30 seconds later. We're currently
scheduling this on the base threadpool which is incorrect,
we need to post it back to the proper sequence.

(cherry picked from commit 29b6bb5)

Bug: b/230023889
Change-Id: I7cc4b5db81c81c99452dd1b49616f2e0938d026d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3601930
Reviewed-by: Francois Pierre Doray <fdoray@chromium.org>
Commit-Queue: Brian Geffon <bgeffon@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Cr-Original-Commit-Position: refs/heads/main@{#995724}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3606475
Auto-Submit: Brian Geffon <bgeffon@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/5005@{#172}
Cr-Branched-From: 5b4d945-refs/heads/main@{#992738}

chromeos/dbus/resourced/resourced_client.cc

@@ -10,6 +10,7 @@
 #include "base/process/process_metrics.h"
 #include "base/task/post_task.h"
 #include "base/task/thread_pool.h"
+#include "base/threading/sequenced_task_runner_handle.h"
 #include "base/time/time.h"
 #include "chromeos/dbus/resourced/fake_resourced_client.h"
 #include "dbus/bus.h"
@@ -246,8 +247,8 @@ void ResourcedClientImpl::HandleSetMemoryMarginBps(
     // If Chrome startup was racing with resourced startup it's possible
     // that the message was not delivered because resourced was not up yet.
     // Let's redispatch the message in 30 seconds.
-    base::ThreadPool::PostDelayedTask(
-        FROM_HERE, {base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN},
+    base::SequencedTaskRunnerHandle::Get()->PostDelayedTask(
+        FROM_HERE,
         base::BindOnce(&ResourcedClientImpl::SetMemoryMarginsBps,
                        weak_factory_.GetWeakPtr(), critical_margin,
                        moderate_margin, std::move(callback)),