chromeos: fix bug where "aw snap" page replaces first tab if it was a NTP when closing window with > 1 tab.

BUG=chromium-os:12088
TEST=verify bug per bug report.
Review URL: http://codereview.chromium.org/6882058

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@83031 0039d316-1c4b-4281-b951-d872f2087c98
  virtual void TabInsertedAt(TabContentsWrapper* contents,
                             int index,
                             bool foreground) {
    empty_ = false;
    State* s = new State(contents, index, INSERT);
    s->foreground = foreground;
    states_.push_back(s);
  }

  virtual void TabInsertedAt(TabContentsWrapper* contents,
                             int index,
                             bool foreground) {
    empty_ = false;
    State* s = new State(contents, index, INSERT);
    s->foreground = foreground;
    states_.push_back(s);
  }
