NaCl: Update revision in DEPS, 945d33419 -> 939a13aa3

This pulls in the following Native Client changes:

939a13a (teravest@chromium.org) Provide an irt_core_lib GN target.
dbf2af4 (sbc@chromium.org) Remove include of build_config.h from nacl_exception.h
e205317 (jfb@chromium.org) PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS
7c8a96b (jfb@chromium.org) Update revision for PNaCl
3d00a54 (jfb@chromium.org) PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS
1de8ba8 (mseaborn@chromium.org) Update codereview.settings following the switch from SVN to Git
7a6cf46 (jfb@chromium.org) Update revision for PNaCl
bc28c0b (jvoung@chromium.org) Fix the native_client URL in the PNaCl REV file.
f8aa9dc (bradnelson@google.com) Adding le32-nacl build of pnacl tools.
cfda521 (teravest@chromium.org) Explicitly include build_config.h.
61b7ba9 (teravest@chromium.org) Output depfile from build_nexe.
2d65c23 (jfb@chromium.org) PNaCl: Update LLVM and Subzero revision in pnacl/COMPONENT_REVISIONS
5f5cd88 (sbc@chromium.org) Fix PNaCl redirectors for i686-nacl-xx -> x86_64-nacl-xx
1baa204 (jvoung@chromium.org) Remove some more dead code and variables from pnacl/build.sh.
f116471 (dschuff@chromium.org) Update revision for PNaCl
01f3d97 (teravest@chromium.org) Always define product_dir in build_nexe.
8a5a846 (mseaborn@chromium.org) Remove the IRT's now-unneeded call to NaClSrpcModuleInit()
c14b58a (mseaborn@chromium.org) Remove NaClPluginLowLevelInitializationComplete() (caller of "init_done" SRPC)
c5d8394 (bradnelson@google.com) Change driver bash scripts to work in devenv.
490e554 (dschuff@chromium.org) PNaCl: Update Clang revision in pnacl/COMPONENT_REVISIONS
2a7391a (sbc@chromium.org) Fix several issues with update_pnacl_tool_revisions.py
fbc3b5c (dschuff@chromium.org) Support filenames with spaces in the PNaCl driver scripts.
4f726e8 (sbc@chromium.org) PNaCl: Update Clang revision in pnacl/COMPONENT_REVISIONS
28a1341 (dschuff@chromium.org) Move pnacl driver test runs from buildbot_pnacl.sh to buildbot_pnacl_toolchain.py
9f9d773 (sbc@chromium.org) Update GCC revision in tools/REVISIONS
29ae54a (jfb@chromium.org) Update revision for PNaCl

BUG=none
TEST=browser_tests and nacl_integration
CQ_EXTRA_TRYBOTS=tryserver.chromium.linux:linux_rel_precise32,linux_arm_compile,linux_nacl_sdk_build

Review URL: https://codereview.chromium.org/881893003

Cr-Commit-Position: refs/heads/master@{#313447}

DEPS

@@ -94,7 +94,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling NaCl
   # and whatever else without interference from each other.
-  'nacl_revision': '945d334190e1b965d5d3ea50981aca41df64235d',
+  'nacl_revision': '939a13aa30cde08f1ae87bb9f2da3bfa12063f52',
 }
 
 # Only these hosts are allowed for dependencies in this DEPS file.