NaCl: Update revision in DEPS, r13115 -> r13137

NaCl: Update revision in DEPS, r13115 -> r13137

This pulls in the following Native Client changes:

r13117: (mseaborn) Add a Scons-to-Ninja converter for getting faster incremental rebuilds
r13118: (mseaborn) Scons: Remove unnecessary use of addRepository() for gtest
r13119: (sbc) Add latest filename interface to IRT and sel_ldr.
r13120: (jvoung) Remove some leftover bits of CloseManifestEntry and Log.
r13121: (jfb) PNaCl SIMD: add test for vector cast and conversion
r13122: (bradnelson) Reduce perf dashboard noise by excluding -dbg builders.
r13123: (dyen) Added arguments to NaCl scons to allow custom toolchain directories.
r13124: (mseaborn) scons_to_ninja: Fix Install() step to coexist with NaCl/SCons's version
r13125: (dschuff) Test pinned PNaCl toolchain and gold plugin on mac and win toolchain bots
r13126: (jfb) LLVM biased sandbox build: fix PNaCl driver script so it knows about more architectures
r13127: (dyen) Fix bionic package_version archives.
r13128: (dyen) Updated nacl_arm_bionic revision to r13127
r13129: (dschuff) Switch PNaCl toolchain package info upload back to toolchain_build_pnacl
r13130: (dyen) Added a way to specify packages with missing archives in package_version.
r13131: (mseaborn) PNaCl: Remove some more references to PNaCl+glibc in naclsdk.py
r13132: (mseaborn) Non-SFI Mode: Add nonsfi_loader and plumbing to test it
r13133: (mseaborn) Fix checkdeps.py failure on src/nonsfi/ produced by r13132
r13134: (noelallen) Fix double crtbegin.o, extra gcc build steps on skip
r13135: (dschuff) Update PNaCl pinned revision to 13129 and switch to toolchain_build_pnacl
r13136: (bradnelson) Add NACL_GOMA_THREADS in build_nexe.py to limit number of threads (for sergeyu)
r13137: (noelallen) Add scons to gn script

BUG=none
TEST=browser_tests and nacl_integration
R=bradnelson@google.com

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=268248

[Sam Clegg, 2014-05-05 17:22:20]

Added *_nacl_sdk trybots.

[Sam Clegg, 2014-05-05 17:22:21]

Added *_nacl_sdk trybots.

[bradn, 2014-05-05 18:43:29]

lgtm

[Mark Seaborn, 2014-05-05 19:41:35]

Committed patchset #1 manually as r268248 (presubmit successful).