Revert of Remove Enable Exits On Suspend flags on iOS

Revert of Remove Enable Exits On Suspend flags on iOS (patchset #1 id:1 of https://codereview.chromium.org/2151553002/ )

Reason for revert:
Broke downstream tree as -[UIApplication cr_interpose_beginBackgroundTaskWithExpirationHandler:] is used.

Original issue's description:
> Remove Enable Exits On Suspend flags on iOS
>
> This CL removes the Enable Exits On Suspend flag on iOS.
>
> BUG=627859
>
> Committed: https://crrev.com/c8ae1453cbc9ee793144a6da2c3a41e5db2aeae2
> Cr-Commit-Position: refs/heads/master@{#406234}

TBR=rohitrao@chromium.org,lpromero@chromium.org,gambard@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=627859
Committed: https://crrev.com/85d1c49c5d6dab4266c8e62a602bed5b523184ae
Cr-Commit-Position: refs/heads/master@{#406257}

[sdefresne, 2016-07-19 12:51:07]

The CQ bit was checked by sdefresne@chromium.org

[sdefresne, 2016-07-19 12:51:07]

Created Revert of Remove Enable Exits On Suspend flags on iOS

[commit-bot: I haz the power, 2016-07-19 12:51:30]

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, 2016-07-19 12:52:15]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-07-19 12:53:30]

Description was changed from

==========
Revert of Remove Enable Exits On Suspend flags on iOS (patchset #1 id:1 of
https://codereview.chromium.org/2151553002/ )

Reason for revert:
Broke downstream tree as -[UIApplication
cr_interpose_beginBackgroundTaskWithExpirationHandler:] is used.

Original issue's description:
> Remove Enable Exits On Suspend flags on iOS
> 
> This CL removes the Enable Exits On Suspend flag on iOS.
> 
> BUG=627859
> 
> Committed: https://crrev.com/c8ae1453cbc9ee793144a6da2c3a41e5db2aeae2
> Cr-Commit-Position: refs/heads/master@{#406234}

TBR=rohitrao@chromium.org,lpromero@chromium.org,gambard@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=627859
==========

to

==========
Revert of Remove Enable Exits On Suspend flags on iOS (patchset #1 id:1 of
https://codereview.chromium.org/2151553002/ )

Reason for revert:
Broke downstream tree as -[UIApplication
cr_interpose_beginBackgroundTaskWithExpirationHandler:] is used.

Original issue's description:
> Remove Enable Exits On Suspend flags on iOS
>
> This CL removes the Enable Exits On Suspend flag on iOS.
>
> BUG=627859
>
> Committed: https://crrev.com/c8ae1453cbc9ee793144a6da2c3a41e5db2aeae2
> Cr-Commit-Position: refs/heads/master@{#406234}

TBR=rohitrao@chromium.org,lpromero@chromium.org,gambard@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=627859

Committed: https://crrev.com/85d1c49c5d6dab4266c8e62a602bed5b523184ae
Cr-Commit-Position: refs/heads/master@{#406257}
==========

[commit-bot: I haz the power, 2016-07-19 12:53:31]

Patchset 1 (id:??) landed as
https://crrev.com/85d1c49c5d6dab4266c8e62a602bed5b523184ae
Cr-Commit-Position: refs/heads/master@{#406257}

[gambard, 2016-07-20 08:23:41]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/2159423002/ by gambard@chromium.org.

The reason for reverting is: Problem fixed..