Delete "local-heuristics-only-for-password-generation" flag.

The flag was used only in the tests and had a dedicated production code.

Bug: 845458
Change-Id: I27265ad5a69eecb31663b5fb1526c696f1b35d3d
Reviewed-on: https://chromium-review.googlesource.com/c/1322831
Reviewed-by: Vadym Doroshenko <dvadym@chromium.org>
Commit-Queue: Vasilii Sukhanov <vasilii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606027}
8 files changed