MD Downloads: improve early loading shim

chrome/browser/resources/md_downloads/manager.js

Index: chrome/browser/resources/md_downloads/manager.js
diff --git a/chrome/browser/resources/md_downloads/manager.js b/chrome/browser/resources/md_downloads/manager.js
index d01c3d336a940552c343cf61beb57fdcb8522e12..ec56d5154198fa614cdb1598b457f7f3a43e4a28 100644
--- a/chrome/browser/resources/md_downloads/manager.js
+++ b/chrome/browser/resources/md_downloads/manager.js
@@ -40,6 +40,7 @@ cr.define('downloads', function() {
     },
 
     hostAttributes: {
+      // TODO(dbeam): this should use a class instead.
       loading: true,
     },
 
@@ -52,6 +53,10 @@ cr.define('downloads', function() {
       'itemsChanged_(items_.*)',
     ],
 
+    attached: function() {
+      document.documentElement.classList.remove('loading');
+    },
+
     /** @private {!PromiseResolver} */
     loaded_: new PromiseResolver,