Improve handling of invalid command line in Me2Me host.

Improve handling of invalid command line in Me2Me host.

Previously the host was DCHECK'ing in remoting::ExitCodeToString()
when started with invalid command line. This was happening because
kHostExitCodeStrings didn't contain all possible error codes.
Also the host was trying to report offline reason, but it makes no sense
to report offline reason in this case.

Committed: https://crrev.com/7e16a84c48423858ca62cd26e46f7dd00c3f96eb
Cr-Commit-Position: refs/heads/master@{#377472}

[Sergey Ulanov, 2016-02-25 01:03:57]

sergeyu@chromium.org changed reviewers:
+ lambroslambrou@chromium.org

[Lambros, 2016-02-25 01:14:43]

lgtm

[Sergey Ulanov, 2016-02-25 01:52:50]

The CQ bit was checked by sergeyu@chromium.org

[commit-bot: I haz the power, 2016-02-25 01:55:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1735523003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1735523003/1

[commit-bot: I haz the power, 2016-02-25 02:39:46]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-02-25 02:42:17]

Description was changed from

==========
Improve handling of invalid command line in Me2Me host.

Previously the host was DCHECK'ing in remoting::ExitCodeToString()
when started with invalid command line. This was happening because
kHostExitCodeStrings didn't contain all possible error codes.
Also the host was trying to report offline reason, but it makes no sense
to report offline reason in this case.
==========

to

==========
Improve handling of invalid command line in Me2Me host.

Previously the host was DCHECK'ing in remoting::ExitCodeToString()
when started with invalid command line. This was happening because
kHostExitCodeStrings didn't contain all possible error codes.
Also the host was trying to report offline reason, but it makes no sense
to report offline reason in this case.

Committed: https://crrev.com/7e16a84c48423858ca62cd26e46f7dd00c3f96eb
Cr-Commit-Position: refs/heads/master@{#377472}
==========

[commit-bot: I haz the power, 2016-02-25 02:42:18]

Patchset 1 (id:??) landed as
https://crrev.com/7e16a84c48423858ca62cd26e46f7dd00c3f96eb
Cr-Commit-Position: refs/heads/master@{#377472}