Let the browser handle external navigations from DevTools.

BUG=180555


Review URL: https://chromiumcodereview.appspot.com/12531004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@186793 0039d316-1c4b-4281-b951-d872f2087c98
  PendingFileChooser(const FileChooserParams& p, WebFileChooserCompletion* c)
      : params(p),
        completion(c) {
  }

  PendingFileChooser(const FileChooserParams& p, WebFileChooserCompletion* c)
      : params(p),
        completion(c) {
  }
