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This reverts commit 4aa12de8.

Reason for revert: Tentative revert as one possible cause of https://crbug.com/1115532

If revert doesn't fix failures, will reland (with apologies :))

Original change's description:
> Oobe: add browser test for gaia screen
> 
> Add browser test to verify behavior for back button on the gaia screen when kChildSpecificSignin feature is enabled.
> 
> Bug: 1101318
> Change-Id: Ibaff1cf629520b3fbbe8cd620d8727bd35922295
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2343068
> Commit-Queue: Denis Kuznetsov [CET] <antrim@chromium.org>
> Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#797176}

TBR=antrim@chromium.org,rsorokin@chromium.org,yunkez@google.com

Change-Id: I8347e80a1b22ab63f60688a8a23809be796b5039
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1101318, 1115532
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2352550Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797255}