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This change renames the already existing feature flag from
kManagePasswordsAlternativeUIAndroid to kGooglePasswordManager to better
reflect that the flag is platform agnostic.

Bug: 904821
Change-Id: I5c7f0e529de53230578b0a25115b6d3428bbf940
Reviewed-on: https://chromium-review.googlesource.com/c/1333651Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607696}