NaCl: Update revision in DEPS, r6859 -> r6880
NaCl: Update revision in DEPS, r6859 -> r6880

This pulls in the following Native Client changes:

r6860: (garianov) Removing stale debug_server from experimental
r6861: (krasin) pnacl: update upstream rev to bring ARM MC fix for relocation an alias to alias.
r6862: (pdox) Add missing nacl_uma_test dependencies for crash_ppapi_off_main_thread and crash_off_main_thread
r6863: (pdox) Roll toolchain DEPS to 6860
r6864: (pdox) Revert r6863
r6865: (dschuff) Disable clang for glibc builds until we fix regparm attribute
r6866: (dschuff) Update LLVM UPSTREAM_REV
r6867: (khim) Cosmetic changes: rename directories in patch, pack the patches.
r6868: (mcgrathr) Fix pychecker complaint about buildbot_selector.py
r6869: (mcgrathr) Wire up ASan buildbots
r6870: (pdox) Add ability to build GCC 4.6 and DragonEgg plugin to utman.sh.
r6871: (pdox) Roll toolchain DEPS to 6870.
r6872: (eugenis) Do not disable warnings when building with ASan.
r6873: (eugenis) Fix read past the end of a global string.
r6874: (pdox) Add driver interfaces "pnacl-dgcc" and "pnacl-dg++" for testing
r6875: (eugenis) Disable python_imc_test under ASan.
r6876: (eugenis) Disable ASan bots.
r6877: (robertm) Update "upstream" rev to pull in
r6878: (eaeltsin) Update binutils revision
r6879: (pdox) Get rid of "pnacl_use_clang" bit, and replace with "pnacl_frontend"
r6880: (robertm) Switch utman to use clang-build libraries and disable a test known to be broken by this.

BUG=none
TEST=nacl_integration


Review URL: http://codereview.chromium.org/8206016

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@104639 0039d316-1c4b-4281-b951-d872f2087c98

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