Fix DCHECH errors on Windows

Fix DCHECH errors on Windows
- Disable initLogging in child processes in Windows, since they always fail to initialize.
- Add RunChildProcessIfNeeded method to Windows, to make it more consistent with Linux implementation and allowing for proper DCHECK test in HeadlessBrowserMain entry point
- Fix issue with headless_shell not containing windows exe manifest

BUG=686608

[dvallet, 2017-04-24 03:24:45]

Description was changed from

==========
Fix DCHECk errors on Windows:
- Disable initLogging in child processes in Windows, since they always fail to
initialized.
- Add RunChildProcessIfNeeded method to Windows, to make it more consistent with
Linux implementation and allowing for proper DCHECK test in HeadlessBrowserMain
entry point
- Fix issue with headless_shell not containing windows exe manifest

BUG=686608
==========

to

==========
Fix DCHECk errors on Windows:
- Disable initLogging in child processes in Windows, since they always fail to
initialize.
- Add RunChildProcessIfNeeded method to Windows, to make it more consistent with
Linux implementation and allowing for proper DCHECK test in HeadlessBrowserMain
entry point
- Fix issue with headless_shell not containing windows exe manifest

BUG=686608
==========

[dvallet, 2017-04-24 03:24:45]

dvallet@chromium.org changed reviewers:
+ jzfeng@chromium.org, skyostil@chromium.org

[dvallet, 2017-04-24 03:24:58]

Description was changed from

==========
Fix DCHECk errors on Windows:
- Disable initLogging in child processes in Windows, since they always fail to
initialize.
- Add RunChildProcessIfNeeded method to Windows, to make it more consistent with
Linux implementation and allowing for proper DCHECK test in HeadlessBrowserMain
entry point
- Fix issue with headless_shell not containing windows exe manifest

BUG=686608
==========

to

==========
Fix DCHECH errors on Windows
- Disable initLogging in child processes in Windows, since they always fail to
initialize.
- Add RunChildProcessIfNeeded method to Windows, to make it more consistent with
Linux implementation and allowing for proper DCHECK test in HeadlessBrowserMain
entry point
- Fix issue with headless_shell not containing windows exe manifest

BUG=686608
==========

[dvallet, 2017-04-24 03:25:03]

The CQ bit was checked by dvallet@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-04-24 03:25:14]

Dry run: 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, 2017-04-24 04:50:13]

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

[commit-bot: I haz the power, 2017-04-24 04:50:14]

Dry run: This issue passed the CQ dry run.

[dvallet, 2017-04-24 04:51:05]

PTAL

[jzfeng, 2017-04-24 05:01:51]

lgtm

[Sami, 2017-04-24 19:00:56]

lgtm