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We are going to remove ipc_task_queue and ipc_task_runner. The scheduling policy of ipc_task_queue is the same as the default task queue. Nowadays, we are using per-frame task queues as much as possible. And if there are no relevant per-frame task queues, then we can use the (per-isolate) default task queues.

[related design doc section]
https://docs.google.com/document/d/1y-vHkrD1z2RtyWYwT6rJkSLHClYNjDDpUbTtBU7l95A/edit#bookmark=id.eeuir8g768ou

Bug: 1105403
Change-Id: I034961b5d320a3a43b93bcbeabbcb495e72a20e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2332089Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Tal Pressman <talp@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Commit-Queue: Minoru Chikamune <chikamune@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794828}