Preserve account selection on rotating the device in Chromoting Android app

This uses a different method of reloading the accounts spinner if the
device is rotated.

R=jamiewalch@chromium.org

Review URL: https://codereview.chromium.org/213823003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@259770 0039d316-1c4b-4281-b951-d872f2087c98