NaCl: Update revision in DEPS, r12757 -> r12770

This pulls in the following Native Client changes:

r12758: (dschuff) llvm-test.py: Use msys make when running regression tests on Windows
r12759: (mcgrathr) Give sel_ldr an option (-d) to raise a no-op signal at startup
r12761: (dyen) Removed extra TLS flags passed into our toolchain
r12762: (mcgrathr) Update chrome_rev to current LKGR
r12763: (mcgrathr) Update tools_rev in DEPS
r12765: (mcgrathr) toolchain_build: Use new version of isl
r12766: (teravest) Remove Log() in ReverseService.
r12767: (bradnelson) Switching perf graph units to "standard" units.
r12768: (mseaborn) Remove unused code relating to a never-finished ARM Thumb sandbox
r12769: (bradnelson) Fixing escaping issue in r12768.
r12770: (jvoung) Update TOOL_REVISIONS for PNaCl r12737->r12765

BUG=none
TEST=nacl_integration
NOTRY=true
(ran try jobs already)

Review URL: https://codereview.chromium.org/163433009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251423 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251424 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251424