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This reverts commit 91feaec9.

Reason for revert: <INSERT REASONING HERE>
This CL causes test fails about signin in settings_egtest.
https://build.chromium.org/p/chromium.fyi/builders/EarlGreyiOS/builds/30291 
You can use EG tryjob by
git cl try -m tryserver.chromium.mac -b ios-simulator-eg

Original change's description:
> Enabling sign-in promo view earlgrey tests
> 
> Bug: 661794
> Change-Id: I9e9844e73583288581e9700228708edc39dfd580
> Reviewed-on: https://chromium-review.googlesource.com/561147
> Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
> Reviewed-by: Eric Noyau <noyau@chromium.org>
> Commit-Queue: Jérôme Lebel <jlebel@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#491761}

TBR=msarda@chromium.org,noyau@chromium.org,jlebel@chromium.org

Change-Id: I26caf6ede4734b0ec89d275ef211ff93e4adf73d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 661794
Reviewed-on: https://chromium-review.googlesource.com/601098Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Commit-Queue: Menglu Huang <huangml@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491880}