GitLab

IsNull and SetToNull aren't needed as the STL string type doesn't use
nullable_is_same_type.

Change-Id: I0770b42e275e3026749c5409015c4b79941ea56f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2386744Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Henrique Ferreiro <hferreiro@igalia.com>
Cr-Commit-Position: refs/heads/master@{#803654}