deploy_chrome: Restart the UI process each time by default.
deploy_chrome: Restart the UI process each time by default.

This simplifies the behavior of the script - it will always try to
restart the ui daemon unless the --nostartui flag is passed in.

Previously the behavior was to restart the ui daemon only if it was
already running when the script started (determined by a 'status ui'
call).

BUG=None
TEST=Tested with and without --nostartui flag.

Change-Id: I5b7c6486782f45b2b62e727ecf2b74c4c18167ae
Reviewed-on: https://gerrit.chromium.org/gerrit/43853
Commit-Queue: Ryan Cui <5ce1592d53754a87a44fc2eb7b63d5f77cf50fdb@chromium.org>
Reviewed-by: Ryan Cui <5ce1592d53754a87a44fc2eb7b63d5f77cf50fdb@chromium.org>
Tested-by: Ryan Cui <5ce1592d53754a87a44fc2eb7b63d5f77cf50fdb@chromium.org>
Reviewed-by: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>

zhang0137/chromite,coreos/chromite,coreos/chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite,zhang0137/chromite,zhang0137/chromite,chadversary/chromiumos.chromite,coreos/chromite,chadversary/chromiumos.chromite