Android: Add remaining @JniType("std::string") where applicable in //base

Bug: 326465150
Change-Id: Ib0eeb36a615c255f649755fd3febb64d6ea4317c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5398857


Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1279213}