NaCl: Update revision in DEPS, r12705 -> r12710

This pulls in the following Native Client changes:

r12706: (jfb) Update TOOL_REVISIONS for PNaCl r12686->r12703
r12707: (dschuff) PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS
r12708: (mseaborn) Remove unneeded ARG_REGISTERS mapping from syscall handler generator
r12709: (teravest) NaCl: Clean up ReverseService::OpenManifestEntry.
r12710: (mseaborn) Expose NaClAppSetDesc() to Chromium for use at startup

BUG=none
TEST=browser_tests and nacl_integration
R=bradnelson@google.com, hidehiko@chromium.org

Review URL: https://codereview.chromium.org/155513005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249274 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249275 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 249275