More unused grit header script improvements:

More unused grit header script improvements:

- Rename to tools/resources/list_unused_grit_header.py.
- Handle structures of type "FOO_{LEFT,RIGHT,TOP}".
- Add ability to scan files and folders.

NOTRY=true

Committed: https://crrev.com/587325d3e6d51b6d05f00982cc088b1be64dd12a
Cr-Commit-Position: refs/heads/master@{#292716}

[Lei Zhang, 2014-08-29 19:26:17]

thestig@chromium.org changed reviewers:
+ tfarina@chromium.org, thakis@chromium.org

[Nico, 2014-08-29 19:33:51]

lgtm

[tfarina, 2014-08-29 20:25:26]

lgtm

[Lei Zhang, 2014-08-29 23:17:39]

The CQ bit was checked by thestig@chromium.org

[commit-bot: I haz the power, 2014-08-29 23:19:41]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/thestig@chromium.org/524743002/1

[commit-bot: I haz the power, 2014-08-29 23:32:20]

Committed patchset #1 (id:1) as daf3568d4cbc5910f282528b6f7062ef53c91025

[commit-bot: I haz the power, 2014-09-10 03:11:41]

Patchset 1 (id:??) landed as
https://crrev.com/587325d3e6d51b6d05f00982cc088b1be64dd12a
Cr-Commit-Position: refs/heads/master@{#292716}