Copy the value of --no-sandbox when launching the worker process.

BUG=330856
R=jam@chromium.org

Review URL: https://codereview.chromium.org/111343008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242736 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242736