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Migrate from using our custom utility and helpers to a similar util
developed and maintained by the EG team. Doc at go/bling-axe

Bug: 856622
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: Ib86b171447eac2961ec2591c8a08764d06b7a953
Reviewed-on: https://chromium-review.googlesource.com/c/1291570
Commit-Queue: Lindsay Pasricha <lindsayw@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608924}