NaCl: Update revision in DEPS, cc52724 -> 2c9f793

NaCl: Update revision in DEPS, cc52724 -> 2c9f793

This pulls in the following Native Client changes:

044b4c0: (mazda@chromium.org) Implement irt_clear_cache for ARM Non-SFI mode.
ebe73dc: (shinyak@chromium.org) Emit deferred log even when Error is raised.
cd4c4d8: (tfarina@chromium.org) Rename source_prereqs to inputs in the rules.gni file.
4eb5734: (dschuff@chromium.org) Update newlib revision in tools/REVISIONS to 2cc581b
2c9f793: (mseaborn@chromium.org) Cleanup: Move nacl_desc_custom.h into src/public/

BUG=none
TEST=browser_tests and nacl_integration
CQ_EXTRA_TRYBOTS=tryserver.chromium.linux:linux_chromium_dbg_32_ng,linux_arm_compile,linux_nacl_sdk_build

Committed: https://crrev.com/b4cee97875a1e24ddbb958b58c68532f44053827
Cr-Commit-Position: refs/heads/master@{#317065}

[Mark Seaborn, 2015-02-19 15:51:52]

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

[JF, 2015-02-19 16:56:37]

（｀ー´）lgtm

[Mark Seaborn, 2015-02-19 17:22:14]

The CQ bit was checked by mseaborn@chromium.org

[commit-bot: I haz the power, 2015-02-19 17:23:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/938823003/1

[commit-bot: I haz the power, 2015-02-19 17:25:57]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-19 17:26:50]

Patchset 1 (id:??) landed as
https://crrev.com/b4cee97875a1e24ddbb958b58c68532f44053827
Cr-Commit-Position: refs/heads/master@{#317065}