[Password Manager] Add link to remotely manage passowrds on desktop

ui/webui/resources/css/overlay.css

Index: ui/webui/resources/css/overlay.css
diff --git a/ui/webui/resources/css/overlay.css b/ui/webui/resources/css/overlay.css
index 2e18f8a08b5a465eea4d13b8630a71b4e293a848..176c186aca00f200dca1e5b360ca49ce7822d3af 100644
--- a/ui/webui/resources/css/overlay.css
+++ b/ui/webui/resources/css/overlay.css
@@ -150,6 +150,10 @@ html[dir='rtl'] .overlay .page .action-area {
   border-color: rgba(0, 0, 0, 0.5);
 }
 
+.overlay .page .spacer-div {
+  -webkit-box-flex: 1;
+}
+
 /* On OSX 10.7, hidden scrollbars may prevent the user from realizing that the
  * overlay contains scrollable content. To resolve this, style the scrollbars on
  * OSX so they are always visible. See http://crbug.com/123010. */