Temporarily remove a DCHECK from createVisibleSelection

Temporarily remove a DCHECK from createVisibleSelection

This patch removes DCHECK(base.isNotNull() || extent.isNull()) from
createVisibleSelection because it doesn't hold for all callers. It will
be added back after we have ensured that.

BUG=651373
Committed: https://crrev.com/7731ccff648c8feb3ede2b8668a25dc0d3a7acfc
Cr-Commit-Position: refs/heads/master@{#422371}

[Xiaocheng, 2016-10-03 03:00:32]

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

[commit-bot: I haz the power, 2016-10-03 03:00:41]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Xiaocheng, 2016-10-03 03:59:38]

xiaochengh@chromium.org changed reviewers:
+ yosin@chromium.org

[Xiaocheng, 2016-10-03 03:59:39]

PTAL.

[yosin_UTC9, 2016-10-03 04:04:08]

lgtm

[commit-bot: I haz the power, 2016-10-03 04:16:53]

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

[commit-bot: I haz the power, 2016-10-03 04:16:53]

Dry run: This issue passed the CQ dry run.

[Xiaocheng, 2016-10-03 04:18:04]

The CQ bit was checked by xiaochengh@chromium.org

[commit-bot: I haz the power, 2016-10-03 04:18:12]

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, 2016-10-03 04:23:31]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-03 04:27:13]

Description was changed from

==========
Temporarily remove a DCHECK from createVisibleSelection

This patch removes DCHECK(base.isNotNull() || extent.isNull()) from
createVisibleSelection because it doesn't hold for all callers. It will
be added back after we have ensured that.

BUG=651373
==========

to

==========
Temporarily remove a DCHECK from createVisibleSelection

This patch removes DCHECK(base.isNotNull() || extent.isNull()) from
createVisibleSelection because it doesn't hold for all callers. It will
be added back after we have ensured that.

BUG=651373

Committed: https://crrev.com/7731ccff648c8feb3ede2b8668a25dc0d3a7acfc
Cr-Commit-Position: refs/heads/master@{#422371}
==========

[commit-bot: I haz the power, 2016-10-03 04:27:13]

Patchset 1 (id:??) landed as
https://crrev.com/7731ccff648c8feb3ede2b8668a25dc0d3a7acfc
Cr-Commit-Position: refs/heads/master@{#422371}