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Complies with
https://chromium.googlesource.com/chromium/src/+/master/styleguide/c++/c++-dos-and-donts.md#initialize-members-in-the-declaration-where-possible

Bug: none
Change-Id: Ie5d21f9bf83bb1dae3ddd9e85b1a0e332687e6ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2347200
Commit-Queue: Min Qin <qinmin@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797134}