The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/bacf62b2fd526c78df2fa64451520888f750bbac

commit bacf62b2fd526c78df2fa64451520888f750bbac
Author: Jason Guo <jiahuiguo@chromium.org>
Date: Tue Mar 27 22:35:01 2018

Clean up experiment flag for sending billing customer number to Payments.

Bug:  826143 
Test: components unittests
Change-Id: Ica7317d74677d5ad67d11d285808ee81326df150
Reviewed-on: https://chromium-review.googlesource.com/981782
Commit-Queue: Jason Guo <jiahuiguo@chromium.org>
Reviewed-by: Sebastien Seguin-Gagnon <sebsg@chromium.org>
Reviewed-by: Jared Saul <jsaul@google.com>
Cr-Commit-Position: refs/heads/master@{#546296}
[modify] https://crrev.com/bacf62b2fd526c78df2fa64451520888f750bbac/chrome/browser/about_flags.cc
[modify] https://crrev.com/bacf62b2fd526c78df2fa64451520888f750bbac/chrome/browser/flag_descriptions.cc
[modify] https://crrev.com/bacf62b2fd526c78df2fa64451520888f750bbac/chrome/browser/flag_descriptions.h
[modify] https://crrev.com/bacf62b2fd526c78df2fa64451520888f750bbac/components/autofill/core/browser/autofill_experiments.cc
[modify] https://crrev.com/bacf62b2fd526c78df2fa64451520888f750bbac/components/autofill/core/browser/autofill_experiments.h
[modify] https://crrev.com/bacf62b2fd526c78df2fa64451520888f750bbac/components/autofill/core/browser/credit_card_save_manager.cc
[modify] https://crrev.com/bacf62b2fd526c78df2fa64451520888f750bbac/components/autofill/core/browser/payments/full_card_request.cc
[modify] https://crrev.com/bacf62b2fd526c78df2fa64451520888f750bbac/components/autofill/core/browser/payments/payments_client.cc
[modify] https://crrev.com/bacf62b2fd526c78df2fa64451520888f750bbac/components/autofill/core/browser/payments/payments_client_unittest.cc
[modify] https://crrev.com/bacf62b2fd526c78df2fa64451520888f750bbac/tools/metrics/histograms/enums.xml