This patch moves the marquee bindings from xbl-marquee.xml to marquee.js and converts them to a UA Widget.
The contenteditable bindings are dropped, replaced with a styling rule that will fix the position of the scrolling text.
Inline styles have been moved to the stylesheet so usage of display: -moz-box can continue to be parsed.
test_bug840098.html is deleted because it is only valid under the context of in-content XBL bindings.
Differential Revision: https://phabricator.services.mozilla.com/D10385
--HG--
rename : layout/style/xbl-marquee/xbl-marquee.css => toolkit/content/widgets/marquee.css
rename : layout/style/xbl-marquee/xbl-marquee.xml => toolkit/content/widgets/marquee.js
extra : moz-landing-system : lando
a685c05ea5