Files.app: Remove separator below “Files” in left nav.

BUG=239282
TEST=manual

Review URL: https://chromiumcodereview.appspot.com/15670008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@202778 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/resources/file_manager/css/file_manager.css

@@ -274,7 +274,6 @@ body[new-ui] .dialog-sidebar-header #app-name {
 
 body[new-ui] .dialog-sidebar-contents {
   -webkit-box-flex: 1;
-  border-top: 1px solid rgb(210, 210, 210);
   display: -webkit-box;
   position: relative;
 }