Revert of Adds support for running unittests using XCTest on iOS.

Revert of Adds support for running unittests using XCTest on iOS. (patchset #2 id:20001 of https://codereview.chromium.org/2226623003/ )

Reason for revert:
frezes unittests on ios bots.

Original issue's description:
> Adds support for running unittests using XCTest on iOS.
>
> Modifies the base TestSuite to check if running under XCTest and return early
> without running tests if so.  This allows XCTest to drive running the individual
> tests, while still allowing the TestSuite to perform setup tasks.
>
> BUG=635509
>
> Committed: https://crrev.com/fc9315e90cf523b90010145980f953f86c077a51
> Cr-Commit-Position: refs/heads/master@{#410698}

TBR=phajdan.jr@chromium.org,mark@chromium.org,rohitrao@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=635509
Committed: https://crrev.com/e32d99be07ac02f74efaa502c18a7b3f7a550788
Cr-Commit-Position: refs/heads/master@{#411028}

[Olivier, 2016-08-10 12:49:03]

The CQ bit was checked by olivierrobin@chromium.org

[Olivier, 2016-08-10 12:49:04]

Created Revert of Adds support for running unittests using XCTest on iOS.

[commit-bot: I haz the power, 2016-08-10 12:49:25]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-08-10 12:50:12]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-08-10 12:52:07]

Description was changed from

==========
Revert of Adds support for running unittests using XCTest on iOS. (patchset #2
id:20001 of https://codereview.chromium.org/2226623003/ )

Reason for revert:
frezes unittests on ios bots.

Original issue's description:
> Adds support for running unittests using XCTest on iOS.
> 
> Modifies the base TestSuite to check if running under XCTest and return early
> without running tests if so.  This allows XCTest to drive running the
individual
> tests, while still allowing the TestSuite to perform setup tasks.
> 
> BUG=635509
> 
> Committed: https://crrev.com/fc9315e90cf523b90010145980f953f86c077a51
> Cr-Commit-Position: refs/heads/master@{#410698}

TBR=phajdan.jr@chromium.org,mark@chromium.org,rohitrao@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=635509
==========

to

==========
Revert of Adds support for running unittests using XCTest on iOS. (patchset #2
id:20001 of https://codereview.chromium.org/2226623003/ )

Reason for revert:
frezes unittests on ios bots.

Original issue's description:
> Adds support for running unittests using XCTest on iOS.
>
> Modifies the base TestSuite to check if running under XCTest and return early
> without running tests if so.  This allows XCTest to drive running the
individual
> tests, while still allowing the TestSuite to perform setup tasks.
>
> BUG=635509
>
> Committed: https://crrev.com/fc9315e90cf523b90010145980f953f86c077a51
> Cr-Commit-Position: refs/heads/master@{#410698}

TBR=phajdan.jr@chromium.org,mark@chromium.org,rohitrao@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=635509

Committed: https://crrev.com/e32d99be07ac02f74efaa502c18a7b3f7a550788
Cr-Commit-Position: refs/heads/master@{#411028}
==========

[commit-bot: I haz the power, 2016-08-10 12:52:08]

Patchset 1 (id:??) landed as
https://crrev.com/e32d99be07ac02f74efaa502c18a7b3f7a550788
Cr-Commit-Position: refs/heads/master@{#411028}