Make the default value of open-in-tab false when the options_ui key is given.

Make the default value of open-in-tab false when the options_ui key is given.

Previously it was true to maintain consistency with the options_page key, but
this introduces more complexity than it avoids for extension developers.

BUG=414920
R=rockot@chromium.org

Committed: https://crrev.com/496b34d93dbf9968d273e1d52f0ebb6f680a4f0c
Cr-Commit-Position: refs/heads/master@{#302200}

[Ken Rockot(use gerrit already), 2014-10-21 18:26:17]

lgtm

[not at google - send to devlin, 2014-10-30 23:55:17]

The CQ bit was checked by kalman@chromium.org

[commit-bot: I haz the power, 2014-10-30 23:56:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/670623004/1

[commit-bot: I haz the power, 2014-10-31 00:42:15]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-31 00:42:50]

Patchset 1 (id:??) landed as
https://crrev.com/496b34d93dbf9968d273e1d52f0ebb6f680a4f0c
Cr-Commit-Position: refs/heads/master@{#302200}