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This reverts commit 2aa5da39.

Reason for revert: reenabling given crrev.com/1864618

Original change's description:
> Disable WelcomeScreenBrowserTest.WelcomeScreenNext.
> 
> Bug: 1014952
> Change-Id: I1df1941c2a0a92d243cb4e4624ae920b150c7694
> Tbr: achuith@chromium.org
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865351
> Reviewed-by: John Budorick <jbudorick@chromium.org>
> Commit-Queue: John Budorick <jbudorick@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#706500}

TBR=achuith@chromium.org,jbudorick@chromium.org

Change-Id: I86cba6fe329f52b5bdcd7b07d04d1dfb40fa65cf
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1014952
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1866407Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706891}