The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/66c9d54c11c470349b1f08ec61e666519f6d5829

commit 66c9d54c11c470349b1f08ec61e666519f6d5829
Author: Jérôme Lebel <jlebel@chromium.org>
Date: Thu Nov 23 14:16:58 2017

[iOS][Signin] Removing Stars.PromoActions histogram

Replaced with:
 + Signin_Impression_FromBookmarkManager
 + MobileSignInPromo.BookmarkManager.ImpressionsTilXButton
 + MobileSignInPromo.BookmarkManager.ImpressionsTilSigninButtons
 + MobileSignInPromo.BookmarkManager.ImpressionsTilDismiss

Bug:  788036 
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I3c6c4f08dc28c7ea1c0e8e0d27b6029f478c8f3a
Reviewed-on: https://chromium-review.googlesource.com/786238
Reviewed-by: Louis Romero <lpromero@chromium.org>
Commit-Queue: Louis Romero <lpromero@chromium.org>
Cr-Commit-Position: refs/heads/master@{#518926}
[modify] https://crrev.com/66c9d54c11c470349b1f08ec61e666519f6d5829/ios/chrome/browser/ui/bookmarks/bookmark_promo_controller.mm