feedback-api: Use base::AssertLongCPUWorkAllowed().

base::AssertLongCPUWorkAllowed() is preferred over DCHECKing that the
thread is not the UI thread.

Bug: 946241
Change-Id: I4e9d555d0c2ecbc87f6ab7d59195549dbe5026d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1954809
Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: J Kardatzke <jkardatzke@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722802}
2 files changed