With URLs that may include any number of directory levels before
even the prefix of our upload, it's difficult (though not impossible)
to upload the icons to a fixed location in the container and
reference that location. A more self-contained approach is just
to embed the icon data directly into the HTML. That is what is
done here.
Change-Id: I12342aa479bac41eb3b401d1e92689a56b3c2a2b
37e12ce9f5