Remove TabContents from TabStripModelObserver::TabDetachedAt.

BUG=107201
TEST=no visible change


Review URL: https://chromiumcodereview.appspot.com/11293205

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@167122 0039d316-1c4b-4281-b951-d872f2087c98
void BrowserCommandController::Observe(
    int type,
    const content::NotificationSource& source,
    const content::NotificationDetails& details) {
  switch (type) {
    case content::NOTIFICATION_INTERSTITIAL_ATTACHED:
      UpdateCommandsForTabState();
      break;

    case content::NOTIFICATION_INTERSTITIAL_DETACHED:
      UpdateCommandsForTabState();
      break;

    default:
      NOTREACHED() << "Got a notification we didn't register for.";
  }
}

void BrowserCommandController::Observe(
    int type,
    const content::NotificationSource& source,
    const content::NotificationDetails& details) {
  switch (type) {
    case content::NOTIFICATION_INTERSTITIAL_ATTACHED:
      UpdateCommandsForTabState();
      break;

    case content::NOTIFICATION_INTERSTITIAL_DETACHED:
      UpdateCommandsForTabState();
      break;

    default:
      NOTREACHED() << "Got a notification we didn't register for.";
  }
}
