NaCl: Update revision in DEPS, r12497 -> r12515

This pulls in the following Native Client changes:

r12498: (mcgrathr) Update ARM toolchain in TOOL_REVISIONS
r12499: (stichnot) Update LLVM testsuite revision in COMPONENT_REVISIONS.
r12500: (sbc) Fix scons error message that occur early on.
r12501: (mseaborn) Fix run_faulted_thread_queue_test to work following PNaCl toolchain update
r12502: (jvoung) Gate running posix_memalign test on TOOLCHAIN_FEATURE_VERSION 3 for PNaCl.
r12503: (bsy) The previous version of NACL_ARRAY_SIZE would call NaClArrayCheckHelper(void*)...
r12504: (yyanagisawa) Enables goma if use_goma GYP_DEFINES is enabled or GOMA_DIR env is set.
r12505: (jvoung) Gate run_iconv_test on TOOLCHAIN_FEATURE_VERSION 3 for PNaCl.
r12506: (kschimpf) PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS
r12507: (mseaborn) Enable testing PNaCl's SJLJ exception handling against the GCC torture tests
r12508: (dschuff) gsd_storage.py: Use the python gsutil script instead of the old batch wrapper
r12509: (mcgrathr) toolchain_build: Use source targets for git checkouts
r12510: (yyanagisawa) Make goma burst configurable.
r12511: (sbc) Re-enable getpid test under glibc.
r12512: (mcgrathr) toolchain_build: Copy gcc sources locally rather than doing two git fetches
r12513: (mostynb) Let's switch to the new arm_version gyp setting instead of the obsoleted armv7 setting.
r12514: (kschimpf) PNaCl: Update LLVM revision in pnacl/COMPONENT_REVISIONS
r12515: (yyanagisawa) Temporary avoid using goma for pnacl-clang compile.

BUG=none
TEST=browser_tests and nacl_integration

Review URL: https://codereview.chromium.org/110513003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239814 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239815 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239815