components: Remove grit_out_dir variable from components_tests.gyp

components: Remove grit_out_dir variable from components_tests.gyp

It should not be necessary to declare this variable at the top of this
gyp file. If it is necessary to declare this variable, this is not the
place to declare it anyway (which also looks pretty random).

BUG=None
TEST=components_unittests
R=blundell@chromium.org

Committed: https://crrev.com/3c4788d375b7c327d2ca865ec845e803e727b73a
Cr-Commit-Position: refs/heads/master@{#315285}

[blundell, 2015-02-06 08:07:32]

lgtm

[tfarina, 2015-02-09 13:07:57]

The CQ bit was checked by tfarina@chromium.org

[commit-bot: I haz the power, 2015-02-09 13:09:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/866553004/1

[commit-bot: I haz the power, 2015-02-09 13:18:11]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-09 13:18:43]

Patchset 1 (id:??) landed as
https://crrev.com/3c4788d375b7c327d2ca865ec845e803e727b73a
Cr-Commit-Position: refs/heads/master@{#315285}