[0.8] importHref fails in IE/FF

[IntranetFactory]

importHref with nested dom-modules fails in IE/FF. The Polymer() script is executed before the dom-module is loaded. I've created an isolated sample in https://github.com/IntranetFactory/polymer-importbug-1

Open demo-import.htm in Chrome - it loads import-element.htm which used importHref to load outer-element.htm. outer-element.htm then uses <link rel="import" href="inner-element.html"> to load an inner-element.html. It works in Chrome.

Opening demo-import.htm in FF or IE11 causes an error TypeError: this.$ is undefined in inner-element.htm as the Polymer( is executed before the dom-module of the inner-element is loaded.

[IntranetFactory]

It works in FF/IE when I move the </dom-module> from line 7 to 17. https://github.com/IntranetFactory/polymer-importbug-1/blob/master/inner-element.html#L7