Code references

In this patch set ("Sent For Review"):
https://codereview.chromium.org/2915763003/#ps340001

chrome/browser/about_flags.cc
chrome/browser/flag_descriptions.*
components/password_manager/core/common/experiments.*
components/password_manager/core/common/password_manager_features.*

Address this comment https://codereview.chromium.org/2915763003/diff/340001/components/password_manager/core/common/password_manager_features.cc#newcode23

Not sure about changes in:
components/autofill/content/renderer/BUILD.gn

The place where the feature affects 
components/autofill/content/renderer/password_autofill_agent.cc
components/autofill/content/renderer/DEPS