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 Browser::ModeChanged(const chrome::search::Mode& old_mode,
                          const chrome::search::Mode& new_mode) {
  UpdateBookmarkBarState(BOOKMARK_BAR_STATE_CHANGE_TAB_STATE);
}

void Browser::ModeChanged(const chrome::search::Mode& old_mode,
                          const chrome::search::Mode& new_mode) {
  UpdateBookmarkBarState(BOOKMARK_BAR_STATE_CHANGE_TAB_STATE);
}
