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This change modifies the "Passwords" entry in the settings page to link
to the Google Password Manager if the necessary conditions are met.
Currently this includes users that are syncing their passwords without
a custom passphrase and for which the corresponding Google Password
Manager experiment is active.

Bug: 904821
Change-Id: If93ee671b1c1b9aee17467aa9382fe5e834ead55
Reviewed-on: https://chromium-review.googlesource.com/c/1350877
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612231}