Speculative fix for SelectorFilter crash.

Speculative fix for SelectorFilter crash.

It looks from the crash log that the string impl() is nullptr. Found no
possible way for a null string to be added to the SpaceSplitString, but
let's add a null check to see if it helps.

R=eae@chromium.org,timloh@chromium.org
BUG=646026
Committed: https://crrev.com/c0b82197f7a02cca29479d667557ff4591ba9ed6
Cr-Commit-Position: refs/heads/master@{#421492}

[rune, 2016-09-27 13:39:48]

The CQ bit was checked by rune@opera.com to run a CQ dry run

[rune, 2016-09-27 13:39:56]

ptal

[commit-bot: I haz the power, 2016-09-27 13:40:01]

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, 2016-09-27 15:10:20]

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

[commit-bot: I haz the power, 2016-09-27 15:10:21]

Dry run: This issue passed the CQ dry run.

[eae, 2016-09-27 17:05:16]

OK, we might want to add a DCHECK?

LGTM

[rune, 2016-09-28 09:13:23]

On 2016/09/27 at 17:05:16, eae wrote:
> OK, we might want to add a DCHECK?

Done.

[rune, 2016-09-28 09:13:30]

The CQ bit was checked by rune@opera.com

[rune, 2016-09-28 09:13:31]

The patchset sent to the CQ was uploaded after l-g-t-m from eae@chromium.org
Link to the patchset: https://codereview.chromium.org/2376703002/#ps20001
(title: "Added DCHECK + comment")

[commit-bot: I haz the power, 2016-09-28 09:13:39]

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, 2016-09-28 10:39:53]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-09-28 10:41:23]

Description was changed from

==========
Speculative fix for SelectorFilter crash.

It looks from the crash log that the string impl() is nullptr. Found no
possible way for a null string to be added to the SpaceSplitString, but
let's add a null check to see if it helps.

R=eae@chromium.org,timloh@chromium.org
BUG=646026
==========

to

==========
Speculative fix for SelectorFilter crash.

It looks from the crash log that the string impl() is nullptr. Found no
possible way for a null string to be added to the SpaceSplitString, but
let's add a null check to see if it helps.

R=eae@chromium.org,timloh@chromium.org
BUG=646026

Committed: https://crrev.com/c0b82197f7a02cca29479d667557ff4591ba9ed6
Cr-Commit-Position: refs/heads/master@{#421492}
==========

[commit-bot: I haz the power, 2016-09-28 10:41:24]

Patchset 2 (id:??) landed as
https://crrev.com/c0b82197f7a02cca29479d667557ff4591ba9ed6
Cr-Commit-Position: refs/heads/master@{#421492}