NaCl: Update revision in DEPS, r12935 -> r12952

This pulls in the following Native Client changes:

r12936: (mseaborn) Remove unused prototype of NaClDescValidationCacheResolve() function
r12937: (teravest) Split NaClChromeMainStartApp() for Chromium IPC.
r12938: (noelallen) Roll bionic toolchain
r12939: (petarj) [MIPS] Implement assembly part in the faulted_thread_queue test
r12940: (jvoung) Fix run.py to return the full 32/64 arch, instead of the short one.
r12941: (jvoung) Disable run.py test under windows coverage.
r12942: (jvoung) PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS
r12943: (kschimpf) PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS
r12944: (kschimpf) PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS
r12945: (noelallen) Roll bionic
r12946: (noelallen) Add GN tool only
r12948: (jvoung) Update TOOL_REVISIONS for PNaCl r12919->r12944
r12949: (thakis) Remove unnecessary preprocessor usage.
r12950: (noelallen) Fix DEPs and cleanup libc warnings
r12951: (dyen) PNaCl toolchain and driver now uses the new toolchain location
r12952: (hidehiko) Extend untrusted Gyp build for targeting x86-32 Non-SFI Mode.

BUG=none
TEST=browser_tests and nacl_integration
R=bradnelson@google.com

Review URL: https://codereview.chromium.org/217533002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@260445 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -28,7 +28,7 @@ vars = {
   "chromiumos_git": "https://chromium.googlesource.com/chromiumos",
   "skia_git": "https://skia.googlesource.com",
   "swig_revision": "230490",
-  "nacl_revision": "12935",
+  "nacl_revision": "12952",
   # After changing nacl_revision, run 'glient sync' and check native_client/DEPS
   # to update other nacl_*_revision's.
   "nacl_tools_revision": "12760",  # native_client/DEPS: tools_rev