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To be consistent with the other creation methods.
See also:
https://chromium-review.googlesource.com/c/chromium/src/+/1281166/4/headless/lib/browser/protocol/protocol_string.h

Bug: chromium:891377
Change-Id: I4cf9a3ccd1dc91b428aa10e28ddbb49c56195622
Reviewed-on: https://chromium-review.googlesource.com/c/1284910Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Johannes Henkel <johannes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600152}