NaCl: Update revision in DEPS, r13637 -> r13655

This pulls in the following Native Client changes:

db60e9b: (sbc@chromium.org) Update glibc revision in tools/REVISIONS (9b15f6a->150657d)
c64c70d: (mseaborn@chromium.org) PNaCl dynamic loading: Add ELF dynamic loader
90f0c78: (jvoung@google.com) PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS
6850127: (mseaborn@chromium.org) Use uint32_t for untrusted pointer args: fstat() and some other syscalls
f128665: (dschuff@chromium.org) Build PNaCl target libraries on mac and run SCons tests on the toolchain bot
9151ed1: (petarj@mips.com) [MIPS] Change output-format to elf32-tradlittlemips-nacl
6ef6c97: (petarj@mips.com) PNaCl: Update binutils revision in pnacl/COMPONENT_REVISIONS
9ae0959: (mseaborn@chromium.org) Use uint32_t for untrusted pointer args: gettimeofday() syscall
a2d9190: (yyanagisawa@chromium.org) Re-enable use of goma on Windows.
b9da09f: (jvoung@chromium.org) PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS
3637eb0: (zhenyu.liang@intel.com) Support Android x86 platform
328c7552: (jvoung@chromium.org) Update revision for PNaCl r13625->r13647
b17c53c: (dyen@chromium.org) Pre-Submit script no longer depends on cwd being in NaCl root.
47107a8: (mseaborn@chromium.org) Reduce bot cycle time: Don't run the "noragel" Gyp build
6ab1ae1: (kschimpf@google.com) PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS
c81a09f: (mcgrathr@chromium.org) toolchain_build: Update binutils revision
bb09389: (mseaborn@chromium.org) Revert r13646: "Re-enable use of goma on Windows."
3f998aa: (mseaborn@chromium.org) Fix regression in loading of mmap()'able nexes on Windows

BUG=406632
TEST=browser_tests and nacl_integration

Review URL: https://codereview.chromium.org/471173004

Cr-Commit-Position: refs/heads/master@{#291614}

DEPS

@@ -155,7 +155,7 @@ deps = {
     Var('chromium_git') + '/external/v8.git' + '@' +  Var('v8_revision'),
 
   'src/native_client':
-   Var('chromium_git') + '/native_client/src/native_client.git' + '@' + 'c49fcd263ff91bc8acba3118b22b71345488896e',
+   Var('chromium_git') + '/native_client/src/native_client.git' + '@' + '3f998aa8b2fd6ea40b7bc9a403bea27e8798c805',
 
   'src/chrome/test/data/extensions/api_test/permissions/nacl_enabled/bin':
    Var('chromium_git') + '/native_client/src/native_client/tests/prebuilt.git' + '@' + '3e17365176c94624f46cace174f61834b7f3c35d',