linux: enable seccomp sandbox by default
linux: enable seccomp sandbox by default

Seeing how the bots feel about this again.

BUG=36133

Review URL: http://codereview.chromium.org/3539015

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@64267 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser