Don't DCHECK that the runloop has been Run on iOS shutdown

Don't DCHECK that the runloop has been Run on iOS shutdown

This resolves minor drift in this file from implementing the shutdown
flow on iOS (for the rare cases when the app is told it is terminating).

BUG=None

Committed: https://crrev.com/23fddbca3e657e69ca0e6718d4a9be2c34821242
Cr-Commit-Position: refs/heads/master@{#316463}

[stuartmorgan, 2015-02-13 09:30:17]

stuartmorgan@chromium.org changed reviewers:
+ mark@chromium.org

[Mark Mentovai, 2015-02-13 13:47:17]

LGTM

[stuartmorgan, 2015-02-14 15:12:58]

The CQ bit was checked by stuartmorgan@chromium.org

[commit-bot: I haz the power, 2015-02-14 15:13:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/925603004/1

[commit-bot: I haz the power, 2015-02-14 15:23:00]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-02-14 15:23:01]

Try jobs failed on following builders:
  android_chromium_gn_compile_rel on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/android_chromiu...)

[stuartmorgan, 2015-02-14 21:47:22]

The CQ bit was checked by stuartmorgan@chromium.org

[commit-bot: I haz the power, 2015-02-14 21:48:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/925603004/1

[commit-bot: I haz the power, 2015-02-14 23:10:32]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-02-14 23:10:33]

Try jobs failed on following builders:
  linux_chromium_chromeos_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[stuartmorgan, 2015-02-15 10:54:42]

The CQ bit was checked by stuartmorgan@chromium.org

[commit-bot: I haz the power, 2015-02-15 10:55:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/925603004/1

[commit-bot: I haz the power, 2015-02-15 12:09:54]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-02-15 12:09:56]

Try jobs failed on following builders:
  linux_chromium_chromeos_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[stuartmorgan, 2015-02-16 12:15:47]

The CQ bit was checked by stuartmorgan@chromium.org

[commit-bot: I haz the power, 2015-02-16 12:16:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/925603004/1

[commit-bot: I haz the power, 2015-02-16 12:57:22]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-16 12:58:35]

Patchset 1 (id:??) landed as
https://crrev.com/23fddbca3e657e69ca0e6718d4a9be2c34821242
Cr-Commit-Position: refs/heads/master@{#316463}