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Using 'default' is the modern C++ approach used by chromium, and some
analysers complain about the old style.

Bug: None
Change-Id: Ic531d39490f3005abb163830dfc312e1351b003a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2249283Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Anand K Mistry <amistry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779559}