Fix issue with list items overlaping the popup image in the file manager.

BUG=None
TEST=None


Review URL: http://codereview.chromium.org/8817023

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113280 0039d316-1c4b-4281-b951-d872f2087c98

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

@@ -281,6 +281,8 @@ div.img-container > img {
   height: 61px;
   background-color: #F0F0F0;
   padding: 0px 14px 0px 14px;
+  position: relative;
+  z-index: 3;
 
   opacity: 1;
   -webkit-transform: translate(0, 0);