Remove unused function in presubmit script

Remove unused function in presubmit script

FilterFiles function is defined but unused in the code.

BUG=

R=machenbach@chromium.org

Committed: https://crrev.com/4e05854068414671bd8a60b11154215332e99e1b
Cr-Commit-Position: refs/heads/master@{#30882}

[thefourtheye, 2015-09-23 04:41:42]

The CQ bit was checked by thechargingvolcano@gmail.com to run a CQ dry run

[commit-bot: I haz the power, 2015-09-23 04:42:00]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1364643002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1364643002/1

[commit-bot: I haz the power, 2015-09-23 04:42:01]

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

[commit-bot: I haz the power, 2015-09-23 04:42:02]

Dry run: No L-G-T-M from a valid reviewer yet. Only full committers are
accepted.
Even if an L-G-T-M may have been provided, it was from a non-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.

[Michael Achenbach, 2015-09-23 07:24:01]

lgtm with comment:

https://codereview.chromium.org/1364643002/diff/1/AUTHORS
File AUTHORS (right):

https://codereview.chromium.org/1364643002/diff/1/AUTHORS#newcode105
AUTHORS:105: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
nit: This list seems somewhat sorted by first name.

[thefourtheye, 2015-09-23 09:27:48]

On 2015/09/23 07:24:01, Michael Achenbach wrote:
> lgtm with comment:
> 
> https://codereview.chromium.org/1364643002/diff/1/AUTHORS
> File AUTHORS (right):
> 
> https://codereview.chromium.org/1364643002/diff/1/AUTHORS#newcode105
> AUTHORS:105: Sakthipriyan Vairamani <mailto:thechargingvolcano@gmail.com>
> nit: This list seems somewhat sorted by first name.

Thanks for the review, I updated the AUTHORS file as suggested. PTAL.

[Michael Achenbach, 2015-09-23 09:29:25]

lgtm

[thefourtheye, 2015-09-23 10:27:24]

The CQ bit was checked by thechargingvolcano@gmail.com

[commit-bot: I haz the power, 2015-09-23 10:27:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1364643002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1364643002/20001

[commit-bot: I haz the power, 2015-09-23 10:52:40]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-09-23 10:52:50]

Patchset 2 (id:??) landed as
https://crrev.com/4e05854068414671bd8a60b11154215332e99e1b
Cr-Commit-Position: refs/heads/master@{#30882}