This is a preparation CL to remove -Wno-user-defined-warnings warning suppression.

Bug: chromium:683349
Change-Id: If883c24ebac66292329abaf01c5d328bfd51c5c9
Reviewed-on: https://chromium-review.googlesource.com/c/1286391Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56727}