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After https://crrev.com/c/1713560 this isn't used anymore.

This also lets us deprecate the kLocalProfileId pref, and remove
password_manager_util_linux.h/cc.

Bug: 950269
Change-Id: Ib0cdc5a0552430a0c087b637eadd7f18e24ea19e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1720639Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Christos Froussios <cfroussios@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683562}