NaCl: Update revision in DEPS, 71515be -> f418b37

NaCl: Update revision in DEPS, 71515be -> f418b37

This pulls in the following Native Client changes:

cdbbbe0: (jfb@chromium.org) PNaCl: Update compiler-rt revision in pnacl/COMPONENT_REVISIONS
67685d6: (kschimpf@google.com) PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS
a47cbb5: (jfb@chromium.org) Update revision for PNaCl
00ba720: (stichnot@chromium.org) Enable ccache in the cmake builds of LLVM and libcxx.
d3dc925: (sbc@chromium.org) pnacl/driver: Allow -whole-archive as well as --whole-archive
7eefe5f: (jfb@chromium.org) Test overflow builtins.
84b4c32: (jfb@chromium.org) PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS
92ab4d5: (jfb@chromium.org) Revert of PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS (patchset #1 id:1 of https://codereview.chromium.org/1008693005/)
8f963fb: (jfb@chromium.org) Revert of Revert of PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS (patchset #1 id:1 of https://codereview.chromium.org/1002423002/)
a1aac24: (bradnelson@google.com) Return zero for segment registers accessed via the debug stub
f418b37: (jfb@chromium.org) PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS

Changes: https://chromium.googlesource.com/native_client/src/native_client/+log/71515be08f1b0993ad0cd96f991266169a3a003e..f418b37b22393d82c08d28ce1c151bed933d2c9b

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/7033cdb89e6acf9928a00f96f0adca2b3b788e43
Cr-Commit-Position: refs/heads/master@{#320951}

[Mark Seaborn, 2015-03-17 17:48:55]

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

[JF, 2015-03-17 17:51:32]

| ｀Д´| lgtm

[Mark Seaborn, 2015-03-17 17:55:54]

The CQ bit was checked by mseaborn@chromium.org

[commit-bot: I haz the power, 2015-03-17 17:56:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1011183002/1

[commit-bot: I haz the power, 2015-03-17 19:08:25]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-17 19:09:15]

Patchset 1 (id:??) landed as
https://crrev.com/7033cdb89e6acf9928a00f96f0adca2b3b788e43
Cr-Commit-Position: refs/heads/master@{#320951}