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
void Browser::SavePage() {
  UserMetrics::RecordAction(UserMetricsAction("SavePage"), profile_);
  TabContents* current_tab = GetSelectedTabContents();
  if (current_tab && current_tab->contents_mime_type() == "application/pdf")
    UserMetrics::RecordAction(UserMetricsAction("PDF.SavePage"), profile_);
  GetSelectedTabContentsWrapper()->download_tab_helper()->OnSavePage();
}

void Browser::SavePage() {
  UserMetrics::RecordAction(UserMetricsAction("SavePage"), profile_);
  TabContents* current_tab = GetSelectedTabContents();
  if (current_tab && current_tab->contents_mime_type() == "application/pdf")
    UserMetrics::RecordAction(UserMetricsAction("PDF.SavePage"), profile_);
  GetSelectedTabContentsWrapper()->download_tab_helper()->OnSavePage();
}
