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This fixes the bug when every window opened from remote NTP tab with
same host as remote NTP but different path would be considered to belong
to same SiteInstance as NTP. That could lead to nasty effects, such as
referrer reset for transfers from Yandex remote NTP.
Basically its a rewrite of
https://chromium-review.googlesource.com/c/chromium/src/+/998178 patch
so it would apply to hosted apps only, as intended, IMHO.

Bug: 859062,718516
Change-Id: I76e90c2ff6311ca99a234e75424f8cba9932c05a
Reviewed-on: https://chromium-review.googlesource.com/1141574
Commit-Queue: Alexander Yashkin <a-v-y@yandex-team.ru>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583199}