NaCl: Update revision in DEPS, r13637 -> r13647

This pulls in the following Native Client changes:

r13638: (sbc) Update glibc revision in tools/REVISIONS (9b15f6a->150657d)
r13639: (mseaborn) PNaCl dynamic loading: Add ELF dynamic loader
r13640: (jvoung) PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS
r13641: (mseaborn) Use uint32_t for untrusted pointer args: fstat() and some other syscalls
r13642: (dschuff) Build PNaCl target libraries on mac and run SCons tests on the toolchain bot
r13643: (petarj) [MIPS] Change output-format to elf32-tradlittlemips-nacl
r13644: (petarj) PNaCl: Update binutils revision in pnacl/COMPONENT_REVISIONS
r13645: (mseaborn) Use uint32_t for untrusted pointer args: gettimeofday() syscall
r13646: (yyanagisawa) Re-enable use of goma on Windows.
r13647: (jvoung) PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS

BUG=none
TEST=browser_tests and nacl_integration
CQ_EXTRA_TRYBOTS=tryserver.chromium.linux:linux_rel_precise32,linux_arm_cross_compile,linux_nacl_sdk_build
TBR=jam@chromium.org

Review URL: https://codereview.chromium.org/474113003

Cr-Commit-Position: refs/heads/master@{#291432}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@291432 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -35,7 +35,7 @@ vars = {
   "skia_git": "https://skia.googlesource.com",
   "boringssl_git": "https://boringssl.googlesource.com",
   "swig_revision": "230490",
-  "nacl_revision": "13637",
+  "nacl_revision": "13647",
   # After changing nacl_revision, run 'glient sync' and check native_client/DEPS
   # to update other nacl_*_revision's.
   "nacl_tools_revision": "13077",  # native_client/DEPS: tools_rev