This flag and its related code will now be deleted. This bug will now track that

 Issue 785263  has been merged into this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/075c6b08515a930980da1e9c5eecbe6105c08daf

commit 075c6b08515a930980da1e9c5eecbe6105c08daf
Author: sczs <sczs@chromium.org>
Date: Fri Dec 08 01:07:41 2017

[ios] Deletes property-animations-toolbar flag and related code.

Bug:  785540 
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ib2ccaf9fddb4389997d2c8787dac0704e7cb95a0
Reviewed-on: https://chromium-review.googlesource.com/813238
Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522664}
[modify] https://crrev.com/075c6b08515a930980da1e9c5eecbe6105c08daf/ios/chrome/browser/about_flags.mm
[modify] https://crrev.com/075c6b08515a930980da1e9c5eecbe6105c08daf/ios/chrome/browser/ios_chrome_flag_descriptions.cc
[modify] https://crrev.com/075c6b08515a930980da1e9c5eecbe6105c08daf/ios/chrome/browser/ios_chrome_flag_descriptions.h
[modify] https://crrev.com/075c6b08515a930980da1e9c5eecbe6105c08daf/ios/chrome/browser/ui/toolbar/public/toolbar_controller_base_feature.h
[modify] https://crrev.com/075c6b08515a930980da1e9c5eecbe6105c08daf/ios/chrome/browser/ui/toolbar/public/toolbar_controller_base_feature.mm
[modify] https://crrev.com/075c6b08515a930980da1e9c5eecbe6105c08daf/ios/chrome/browser/ui/toolbar/toolbar_controller+protected.h
[modify] https://crrev.com/075c6b08515a930980da1e9c5eecbe6105c08daf/ios/chrome/browser/ui/toolbar/toolbar_controller.mm
[modify] https://crrev.com/075c6b08515a930980da1e9c5eecbe6105c08daf/ios/chrome/browser/ui/toolbar/web_toolbar_controller.mm

Verified on chrome canary version 65.0.3292.0, property-animations-toolbar flag is not available in chrome://flags.  Marking the status to verified.