Revert of Bailing out if pc factory fails to get created.

Revert of Bailing out if pc factory fails to get created. (patchset #1 id:1 of https://codereview.webrtc.org/1339923004/ )

Reason for revert:
Breaks goma (??!??!?)

Original issue's description:
> Bailing out if pc factory fails to get created.
>
> This prevents us from continuing if we fail initialization.
> The failure will happen closer to its source, rather than
> when we try to create the first peer connection.
>
> BUG=None
> R=glaznev@webrtc.org
>
> Committed: https://crrev.com/6eb75d9e67f02c256436eb96f3c77026486561a1
> Cr-Commit-Position: refs/heads/master@{#9948}

TBR=glaznev@webrtc.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=None

Committed: https://crrev.com/01ddf01d9c787601064a28a01ce60476aeeaa9d0
Cr-Commit-Position: refs/heads/master@{#9949}

[phoglund, 2015-09-16 07:03:31]

Created Revert of Bailing out if pc factory fails to get created.

[commit-bot: I haz the power, 2015-09-16 07:03:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1344363002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1344363002/1

[commit-bot: I haz the power, 2015-09-16 07:03:47]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-16 07:03:50]

Patchset 1 (id:??) landed as
https://crrev.com/01ddf01d9c787601064a28a01ce60476aeeaa9d0
Cr-Commit-Position: refs/heads/master@{#9949}