NaCl: Update revision in DEPS, r12181 -> r12194

This pulls in the following Native Client changes:

r12182: (mcgrathr) Clear callee-saved NEON registers at thread startup
r12183: (sehr) Remove unused glibc build from PNaCl's build.sh
r12184: (dschuff) PNaCl: Update LLVM revision in pnacl/DEPS
r12185: (dschuff) Update archived bitcode revisions for PNaCl FYI bitcode stability tests
r12186: (dschuff) Update PNaCl TOOL_REVISIONS, 12180->12184
r12187: (jvoung) Revert r12140: PNaCl: Put newlib before libnacl on the link line.
r12188: (khim) Fix dfacheckvalidator test
r12189: (khim) Use objdump from NaCl toolchain
r12190: (khim) Fix the build
r12191: (jvoung) Update PNaCl bitcode size perf expectations, for smaller bitcode.
r12192: (jvoung) Update PNaCl TOOL_REVISION 12184 -> 12187
*r12193: (phosek) Extended IRT filesystem interfaces
r12194: (mcgrathr) Make NaClSwitch and __x86.pc_thunk.ax assembly symbols hidden

*r12193 requires a change to shim_ppapi.c to #include the new irt_dev.h header.

BUG=none
TEST=browser_tests and nacl_integration

Review URL: https://codereview.chromium.org/24165008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225210 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225211 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 225210
SVN changes up to revision 225211