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This change contains a small number fixes for the upcoming
base::string16 switch to std::u16string.

Bug: 911896
Change-Id: I2fabb795c61d6711f0818d655b400593398fd779
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1773223Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#691630}