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The long-term plan is to remove base::NullableString16 and just use
base::Optional<base::string16> directly.

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_site_isolation
Change-Id: I43b994de70262326b0ca148d888b4424f9d4a795
Reviewed-on: https://chromium-review.googlesource.com/699860
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Patrick Noland <pnoland@google.com>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506970}