Delete index.lock files before checking out master branch.

Delete index.lock files before checking out master branch.

BUG=421971
NOTRY=true

Committed: https://crrev.com/f7bcf0f223a64972ba7b4f53d0c618d9649a882b
Cr-Commit-Position: refs/heads/master@{#298978}

[prasadv, 2014-10-09 19:33:33]

prasadv@chromium.org changed reviewers:
+ qyearsley@chromium.org, robertocn@chromium.org

[RobertoCN, 2014-10-09 19:52:02]

LGTM

[prasadv, 2014-10-09 20:07:52]

The CQ bit was checked by prasadv@chromium.org

[commit-bot: I haz the power, 2014-10-09 20:09:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/640733004/1

[commit-bot: I haz the power, 2014-10-09 20:09:44]

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

[commit-bot: I haz the power, 2014-10-09 20:09:45]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[prasadv, 2014-10-09 20:10:45]

prasadv@chromium.org changed reviewers:
+ chrisphan@chromium.org

[chrisphan, 2014-10-09 21:22:41]

On 2014/10/09 20:10:46, prasadv wrote:

LGTM

[prasadv, 2014-10-09 21:22:57]

The CQ bit was checked by prasadv@chromium.org

[commit-bot: I haz the power, 2014-10-09 21:23:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/640733004/1

[commit-bot: I haz the power, 2014-10-09 21:25:24]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-09 21:26:10]

Patchset 1 (id:??) landed as
https://crrev.com/f7bcf0f223a64972ba7b4f53d0c618d9649a882b
Cr-Commit-Position: refs/heads/master@{#298978}