[FileBrowser] Restored visibility of eject button on unselected removable drives.

BUG=155666


Review URL: https://chromiumcodereview.appspot.com/11143021

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@162347 0039d316-1c4b-4281-b951-d872f2087c98

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

@@ -311,7 +311,7 @@ div.root-eject {
   cursor: pointer;
   height: 20px;
   margin-right: 6px;
-  opacity: 0;
+  opacity: 0.7;
   width: 20px;
 }