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It is not a general purpose substitute for the default std::string
constructor. Do the same for base::EmptyString16() and base::string16().

Change-Id: I49016d1a97f40818e9387d4cd16e859e19d6eed3
Reviewed-on: https://chromium-review.googlesource.com/c/1295181Reviewed-by: Shu Chen <shuchen@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601871}