NaCl: Update revision in DEPS, r6677 -> r6684

This pulls in the following Native Client changes:

r6678: (khim) Bump glibc revision.
r6679: (kschimpf) Move the x86-64 table generator to its own directory.
r6680: (robertm) Restrict llvm inlining to some more sane level.
r6681: (robertm) Roll deps to pull in latests pnacl toolchain with new inliner configuration.
r6682: (jvoung) Remove filter (that removed opt) in irt_env for bitcode=1
r6683: (mcgrathr) Add syscall and test for checking for FPU information leaks
r6684: (mcgrathr) Add nacl_interface_query public function

BUG=none
TEST=nacl_integration


Review URL: http://codereview.chromium.org/7878006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@100875 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/DEPS b/DEPS
index 26df1be..af000da 100644
--- a/DEPS
+++ b/DEPS
@@ -7,7 +7,7 @@
   "webkit_revision": "95015",
   "chromium_git": "http://git.chromium.org/git",
   "swig_revision": "69281",
-  "nacl_revision": "6677",
+  "nacl_revision": "6684",
   # After changing nacl_revision, run 'glient sync' and check native_client/DEPS
   # to update other nacl_*_revision's.
   # TODO(brettw) We should use the "From" syntax to avoid hardcoding the