Update libcros to 168 and update cros_system_api.

BUG=chromium-os:17167
TEST=None


Review URL: http://codereview.chromium.org/7840013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@99864 0039d316-1c4b-4281-b951-d872f2087c98

tools/cros.DEPS/DEPS

@@ -5,7 +5,7 @@ vars = {
 deps_os = {
   "unix" : {
     "src/third_party/cros":
-      Var("chromiumos_git") + "/platform/cros.git@b8c14eed",
+      Var("chromiumos_git") + "/platform/cros.git@b9cc80a6",
     "src/third_party/cros_system_api":
       Var("chromiumos_git") + "/platform/system_api.git@618fb005",
   }