ash: Cleanup ash_strings target.

ash: Cleanup ash_strings target.

While I'm here make it more consistent with the other foo_strings.gyp we have
in the tree.

Some changes:
1) Make it use grit_target.gypi
2) Have a consistent and path oriented grit_out_dir.
3) Prefix the action name with generate_
4) Remove direct_dependent_settings, since that is what grit_target.gypi
is for.

R=jamescook@chromium.org
TBR=thestig@chromium.org # for trivial change in chrome/

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=270863

[tfarina, 2014-05-14 17:42:29]

small cleanup. ptal.

[James Cook, 2014-05-14 19:03:23]

LGTM

[tfarina, 2014-05-15 22:31:25]

The CQ bit was checked by tfarina@chromium.org

[commit-bot: I haz the power, 2014-05-15 22:31:45]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tfarina@chromium.org/281183002/1

[commit-bot: I haz the power, 2014-05-15 23:59:03]

Change committed as 270863