sh implementation to avoid unwanted resizes during iteration.

sh implementation to avoid unwanted resizes during iteration.

This is a port of the following AOSP patch:
  https://android-review.googlesource.com/#/c/68853/

It fixes a bug that happens when trying to delete items from
a lhash table while it is being iterated over with a call
to lh_doall or lh_doall_arg.

It looks like the source tree is slightly out-of-sync from
the state of running ./import_from_android.sh, but the differences
are minor / not significant.

This patch tries to fix a P1 bug, so doesn't try to address this
(the differences have been removed for easier reviewing).

BUG=298606
R=agl@chromium.org,rsleevi@chromium.org,wtc@chromium.org
TBR=darin@chromium.org

[digit1, 2013-11-05 12:45:38]

This is a trivial svn-based re-upload of
https://chromiumcodereview.appspot.com/57833003/ given that "git cl push"
doesn't seem to work for me.

[darin (slow to review), 2013-11-05 17:24:54]

LGTM

[commit-bot: I haz the power, 2013-11-05 17:28:25]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/digit@chromium.org/59793002/1

[commit-bot: I haz the power, 2013-11-05 17:28:54]

Change committed as 233017