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SystemWebAppManager::NeedsUpdate() will check whether current locale is
consistent with the locale that system web apps were installed with. If
not (i.e. when user changes it), request to reinstall apps in order to
keep their launcher localization (title, icons, etc.) synchronized to
current locale.

- Add a preference kSystemWebAppLastInstalledLocale to store locale at
  installation time.
- Check install results of apps before storing locale

Fixes: 1020442
Change-Id: I16f99a81fb5a06a634078914ff4fd9d745f5f73c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1898887Reviewed-by: calamity <calamity@chromium.org>
Commit-Queue: Jiewei Qian  <qjw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712907}