Do not pass URLs in onUpdated events to extensions unless they have the
"tabs" permission.

BUG=168442


Review URL: https://chromiumcodereview.appspot.com/11824004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@176406 0039d316-1c4b-4281-b951-d872f2087c98
bool ExtensionTabUtil::GetDefaultTab(Browser* browser,
                                     content::WebContents** contents,
                                     int* tab_id) {
  NOTIMPLEMENTED();
  return false;
}

bool ExtensionTabUtil::GetDefaultTab(Browser* browser,
                                     content::WebContents** contents,
                                     int* tab_id) {
  NOTIMPLEMENTED();
  return false;
}
