Bug 913229 - Snapped displays cropped multi-column tiles after touch scroll r=mbrubeck

--HG--
extra : rebase_source : bda64fdfb199f0581d2c4f0154afdabebd6700c7

browser/metro/base/content/browser.js

@@ -1143,9 +1143,12 @@ Browser.MainDragger.prototype = {
   },
 
   _hideScrollbars: function _hideScrollbars() {
-    this._scrollScales.x = 0, this._scrollScales.y = 0;
+    this._scrollScales.x = 0;
+    this._scrollScales.y = 0;
     this._horizontalScrollbar.removeAttribute("panning");
     this._verticalScrollbar.removeAttribute("panning");
+    this._horizontalScrollbar.removeAttribute("width");
+    this._verticalScrollbar.removeAttribute("height");
     this._horizontalScrollbar.style.MozTransform = "";
     this._verticalScrollbar.style.MozTransform = "";
   }