Don't focus the location bar for NTP navigations in non-selected tabs.

BUG=677716
TEST=See bug for repro steps.

Review-Url: https://codereview.chromium.org/2624373002
Cr-Commit-Position: refs/heads/master@{#443338}
void Browser::TabStripEmpty() {
  base::ThreadTaskRunnerHandle::Get()->PostTask(
      FROM_HERE, base::Bind(&Browser::CloseFrame, weak_factory_.GetWeakPtr()));

  instant_controller_.reset();
}

void Browser::TabStripEmpty() {
  base::ThreadTaskRunnerHandle::Get()->PostTask(
      FROM_HERE, base::Bind(&Browser::CloseFrame, weak_factory_.GetWeakPtr()));

  instant_controller_.reset();
}
