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This reverts commit bedb24da.

Reason for revert: the test is flaky / failing on MSan

Original change's description:
> [Profile creation] Add {back,reload} accelerators for navigation
>
> This CL adds two accelerators into the profile creation flow to improve
> accessibility and usability:
>  - the back action for screens that actually show the back button
>  - the reload action for the sign-in flow that happens over the internet
>    and thus loading of the page can fail.
>
> Bug: 1126913, 1167675
> Change-Id: I3c197dea2859c0136db62249064249e0569a93da
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627403
> Auto-Submit: Jan Krcal <jkrcal@chromium.org>
> Commit-Queue: David Roger <droger@chromium.org>
> Reviewed-by: David Roger <droger@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#844695}

TBR=droger@chromium.org,jkrcal@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com

Change-Id: I50060ea130339fe25df000ecffaf7e474ba285b8
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1126913
Bug: 1167675
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2637595Reviewed-by: Jan Krcal <jkrcal@chromium.org>
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844751}