NaCl: Update revision in DEPS, r13748 -> r13759

This pulls in the following Native Client changes:

r13749: (jvoung) PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS
r13750: (dyen) Added tests for remaining directory functions in irt_ext.
r13751: (uekawa) NonSFI mode: Make tests/common/register_set.h PIC-friendly
r13752: (uekawa) NonSFI mode: Add libcrt_platform for native/mixed linking.
r13753: (dschuff) Remove i686-hosted Linux build and start switching to new directory layout
r13754: (dschuff) export_header.py: Mangle include guards in exported headers
r13755: (bradnelson) Turning on goma on nacl bots.
r13756: (dbrazdil) Implemented the _exit() syscall in MinSFI.
r13757: (bradnelson) Disable goma on win7-32 bots because it doesn't suport that platform.
r13758: (mseaborn) Cleanup: Use NaClCopyInFromUser() in one case in mmap()
r13759: (dschuff) Update revision for PNaCl r13739->r13753

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

Review URL: https://codereview.chromium.org/582213004

Cr-Commit-Position: refs/heads/master@{#295668}

DEPS

@@ -87,7 +87,7 @@ 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': 'd4f6ba5e0cd805c6f8085f5f69d06a5e17341d16', # from svn revision r13748
+  'nacl_revision': '5e4816da8d5258d7f917f0e859444755c6509410', # from svn revision r13759
 }
 
 deps = {