seccompsandbox: Update revision in DEPS, r170 -> r178
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: de016e52bd170d2d4f2344f9bf92d50478b649e0@110844 0039d316-1c4b-4281-b951-d872f2087c98

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