Revert of Disable broken iOS10 password manager tests. (patchset #4 id:60001 of https://codereview.chromium.org/2180773002/ )

Reason for revert:
Fixed by https://codereview.chromium.org/2187343003/

Original issue's description:
> Disable broken iOS10 password manager tests.
>
> Some keychain access is currently broken on the latest Xcode beta.
>
> BUG=619982
>
> Committed: https://crrev.com/4c702c39d959fc972e9226c008a19cd8b3df4fce
> Cr-Commit-Position: refs/heads/master@{#407486}

TBR=rohitrao@chromium.org,vabr@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=619982
TBR=vabr

Review-Url: https://codereview.chromium.org/2202403002
Cr-Commit-Position: refs/heads/master@{#409274}
2 files changed