Crash on channel error in single-process mode.

Crash on channel error in single-process mode.

If the renderer gets a channel error in single process mode, something
has gone very wrong; it won't be possible for the browser to start a new
renderer as it's not possible to restart it in single-process mode, so
just crash right now to make the stack more clearly point at the
culprit.

BUG=514141
Committed: https://crrev.com/88b66452fff32a11b4db1dbfe486acd9fa8617b0
Cr-Commit-Position: refs/heads/master@{#391217}

[Torne, 2016-05-03 12:02:19]

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

[commit-bot: I haz the power, 2016-05-03 12:02:36]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1942273002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1942273002/1

[Torne, 2016-05-03 12:03:56]

torne@chromium.org changed reviewers:
+ jochen@chromium.org, johnme@chromium.org

[Torne, 2016-05-03 12:03:57]

Companion to https://codereview.chromium.org/1900513003/

I think it'd be reasonable to land this and leave it there if it doesn't break
anything - will see what the trybots think.

[jochen (gone - plz use gerrit), 2016-05-03 12:05:20]

lgtm

[commit-bot: I haz the power, 2016-05-03 12:57:16]

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

[commit-bot: I haz the power, 2016-05-03 12:57:17]

Dry run: This issue passed the CQ dry run.

[Torne, 2016-05-03 13:18:30]

The CQ bit was checked by torne@chromium.org

[commit-bot: I haz the power, 2016-05-03 13:18:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1942273002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1942273002/1

[commit-bot: I haz the power, 2016-05-03 13:22:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-03 13:23:51]

Description was changed from

==========
Crash on channel error in single-process mode.

If the renderer gets a channel error in single process mode, something
has gone very wrong; it won't be possible for the browser to start a new
renderer as it's not possible to restart it in single-process mode, so
just crash right now to make the stack more clearly point at the
culprit.

BUG=514141
==========

to

==========
Crash on channel error in single-process mode.

If the renderer gets a channel error in single process mode, something
has gone very wrong; it won't be possible for the browser to start a new
renderer as it's not possible to restart it in single-process mode, so
just crash right now to make the stack more clearly point at the
culprit.

BUG=514141

Committed: https://crrev.com/88b66452fff32a11b4db1dbfe486acd9fa8617b0
Cr-Commit-Position: refs/heads/master@{#391217}
==========

[commit-bot: I haz the power, 2016-05-03 13:23:52]

Patchset 1 (id:??) landed as
https://crrev.com/88b66452fff32a11b4db1dbfe486acd9fa8617b0
Cr-Commit-Position: refs/heads/master@{#391217}