NaCl: Update revision in DEPS, r13452 -> r13456

This pulls in the following Native Client changes:

r13453: (noelallen) Create GN files for trusted source libraries.
r13454: (dyen) Added support for uploading log urls when uploading toolchain packages.
r13455: (dyen) Updated some documentation for the package_version files.
r13456: (dschuff) Give the minidump_generator_lib gyp rule a shorter name

BUG=none
TEST=browser_tests and nacl_integration
CQ_EXTRA_TRYBOTS=tryserver.chromium:linux_rel_precise32,linux_arm_cross_compile,linux_nacl_sdk_build
R=binji@chromium.org

Review URL: https://codereview.chromium.org/377083003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@282066 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": "13452",
+  "nacl_revision": "13456",
   # 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