Stop using C++20 initialization

Named initialization is proposed for C++20 and we are supposed to be using
only C++14. It just happens to also be an old GCC extension also implemented
by clang.

Change-Id: I1a2f15a90bb4975aacb37812ed711ecb8481ac96
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1478159
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#639116}
7 files changed