browser test startup timeout from 10s to 20s https://codereview.appspot.com/13688044
browser test startup timeout from 10s to 20s
https://codereview.appspot.com/13688044

10s is on the edge of reliable on my macbookpro.
it's mostly unreliable on the autobuild machine.
raising to 20s.

R=kpreid2



git-svn-id: eb21526166532bd3afc2c1499c0cf105ce815f5a@5596 360991c0-9f3b-0410-ba87-8b362a00edf4

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