NaCl: Update revision in DEPS, r13655 -> r13666

This pulls in the following Native Client changes:

r13657: (sbc) Disable two glibc tests: tst-truncate and tst-truncate64
r13658: (jvoung) Avoid up/downloading scratch copy of pnaclmm.bc from generating libpnaclmm.a.
r13659: (mseaborn) Use uint32_t for untrusted pointer args: read() and write() syscalls
r13660: (mseaborn) PNaCl dynamic loader: Fix a corner case with mapping the BSS
r13661: (kschimpf) Update revision for PNaCl r13647->r13658
r13666: (dyen) Added initial implementation of the IRT extension interface.

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

Review URL: https://codereview.chromium.org/509703003

Cr-Commit-Position: refs/heads/master@{#292071}

DEPS

@@ -170,7 +170,7 @@ deps = {
     Var('chromium_git') + '/external/v8.git' + '@' +  Var('v8_revision'),
 
   'src/native_client':
-   Var('chromium_git') + '/native_client/src/native_client.git' + '@' + '3f998aa8b2fd6ea40b7bc9a403bea27e8798c805',
+   Var('chromium_git') + '/native_client/src/native_client.git' + '@' + 'cb44d524fdfeb47a4d5b5946efa439a4f857f080',
 
   'src/chrome/test/data/extensions/api_test/permissions/nacl_enabled/bin':
    Var('chromium_git') + '/native_client/src/native_client/tests/prebuilt.git' + '@' + '3e17365176c94624f46cace174f61834b7f3c35d',