alternate ntp: fix Back to show alternate NTP instead of old NTP
alternate ntp: fix Back to show alternate NTP instead of old NTP

we were going back to old NTP when a query is done from the alternate NTP,
because we weren't observing the new tab's search model when the tab has
changed.

BUG=134915
TEST=verify per bug rpt


Review URL: https://chromiumcodereview.appspot.com/10701083

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@145389 0039d316-1c4b-4281-b951-d872f2087c98

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