Files.app: eject icon should not shrink.

BUG=394193

Review URL: https://codereview.chromium.org/396123002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@283488 0039d316-1c4b-4281-b951-d872f2087c98

ui/file_manager/file_manager/foreground/css/file_manager.css

@@ -361,6 +361,7 @@ div.splitter {
       url('../images/files/ui/eject.png') 1x,
       url('../images/files/ui/2x/eject.png') 2x) no-repeat center;
   cursor: pointer;
+  flex: none;
   height: 20px;
   margin-right: 6px;
   opacity: 0.7;