Rename gyp variable use_titlecase_in_grd_files -> use_titlecase_in_grd

Rename gyp variable use_titlecase_in_grd_files -> use_titlecase_in_grd

See tools/gyp/pylib/gyp/input.py:
"Sections mathing the regexp '_(dir|file|path)s?$' are also considered PathSections."

Standard gyp variables should not be named like this.

BUG=

Committed: https://crrev.com/a91e86837e8af810c14543eb01851b7881ff95d8
Cr-Commit-Position: refs/heads/master@{#294166}

[joleksy, 2014-09-09 07:57:58]

joleksy@opera.com changed reviewers:
+ nileshagrawal@chromium.org

[joleksy, 2014-09-09 07:58:15]

@reviewer: does it look ok to you?

[Mark Mentovai, 2014-09-09 13:05:38]

mark@chromium.org changed reviewers:
+ mark@chromium.org

[Mark Mentovai, 2014-09-09 13:05:39]

LGTM

[joleksy, 2014-09-10 07:01:52]

On 2014/09/09 13:05:39, Mark Mentovai wrote:
> LGTM

I created also related Breakpad patch: https://breakpad.appspot.com/5694002/

[joleksy, 2014-09-10 12:48:57]

The CQ bit was checked by joleksy@opera.com

[commit-bot: I haz the power, 2014-09-10 12:49:30]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/joleksy@opera.com/552203002/1

[commit-bot: I haz the power, 2014-09-10 13:50:58]

Committed patchset #1 (id:1) as 5aa1e7f3a8e746762a8c9441b370d68f7216ffd8

[commit-bot: I haz the power, 2014-09-10 13:53:31]

Patchset 1 (id:??) landed as
https://crrev.com/a91e86837e8af810c14543eb01851b7881ff95d8
Cr-Commit-Position: refs/heads/master@{#294166}