MD downloads: add a narrow mode for smaller windows

chrome/browser/resources/md_downloads/toolbar.js

Index: chrome/browser/resources/md_downloads/toolbar.js
diff --git a/chrome/browser/resources/md_downloads/toolbar.js b/chrome/browser/resources/md_downloads/toolbar.js
index 647778d647d8a868721d4b233c62dfa5c73ba549..bc83c00e979e86fcb0698db3167ac89186612706 100644
--- a/chrome/browser/resources/md_downloads/toolbar.js
+++ b/chrome/browser/resources/md_downloads/toolbar.js
@@ -84,9 +84,16 @@ cr.define('downloads', function() {
 
     /** @private */
     updateClearAll_: function() {
-      this.$['clear-all'].hidden = !this.canClearAll();
+      this.$$('#actions .clear-all').hidden = !this.canClearAll();
+      this.$$('paper-menu .clear-all').hidden = !this.canClearAll();
     },
   });
 
   return {Toolbar: Toolbar};
 });
+
+// TODO(dbeam): https://github.com/PolymerElements/iron-dropdown/pull/16/files
+/** @suppress {checkTypes} */
+(function() {
+Polymer.IronDropdownScrollManager.pushScrollLock = function() {};
+})();