seccompsandbox: Update revision in DEPS, r170 -> r178

This fixes time() on Linux 3.1.

BUG=104084
TEST=trybots


Review URL: http://codereview.chromium.org/8536053

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110844 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -45,7 +45,7 @@ deps = {
     (Var("googlecode_url") % "google-url") + "/trunk@162",
 
   "src/seccompsandbox":
-    (Var("googlecode_url") % "seccompsandbox") + "/trunk@170",
+    (Var("googlecode_url") % "seccompsandbox") + "/trunk@178",
 
   "src/sdch/open-vcdiff":
     (Var("googlecode_url") % "open-vcdiff") + "/trunk@40",