NaCl: Update revision in DEPS, r13947 -> r13953

NaCl: Update revision in DEPS, r13947 -> r13953

This pulls in the following Native Client changes:

r13948: (mseaborn) Clean up sys/errno.h's #include guard to match the file's name
r13949: (glider) Filter -fsanitize=undefined from cflags when nacl_bootstrap_lib.
r13950: (jvoung) Build gold.nexe with a segment gap, and supply -B, to later support IRT use.
r13952: (jvoung) Add irt_load_optional flag to chrome_main args. Helps w/ making pnacl ld.nexe use IRT.
r13953: (nfullagar) Prep for sdk inclusion - make source more relocatable, so

BUG=none
TEST=browser_tests and nacl_integration
CQ_EXTRA_TRYBOTS=tryserver.chromium.linux:linux_rel_precise32,linux_nacl_sdk,linux_chromium_dbg

Committed: https://crrev.com/bb964c802787ff8e1a0226fda9ffeb81d7824e3e
Cr-Commit-Position: refs/heads/master@{#300592}

[Mark Seaborn, 2014-10-21 20:04:05]

mseaborn@chromium.org changed reviewers:
+ dschuff@chromium.org

[Derek Schuff, 2014-10-21 20:57:21]

lgtm

[Mark Seaborn, 2014-10-21 21:27:32]

The CQ bit was checked by mseaborn@chromium.org

[commit-bot: I haz the power, 2014-10-21 21:28:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/666493004/1

[commit-bot: I haz the power, 2014-10-22 01:08:41]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-22 04:04:31]

Patchset 1 (id:??) landed as
https://crrev.com/bb964c802787ff8e1a0226fda9ffeb81d7824e3e
Cr-Commit-Position: refs/heads/master@{#300592}