Allow hiding of sessions from Other Devices via context menu.

chrome/browser/resources/ntp4/footer_menu.css

 /* Copyright (c) 2012 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file. */
 
 .footer-menu-button {
   -webkit-appearance: none;
   -webkit-padding-end: 15px;
   -webkit-padding-start: 9px;
   -webkit-transition: opacity 200ms;
   -webkit-transition-delay: 100ms;
@@ skipping 27 matching lines @@
 }
 
 .footer-menu {
   max-height: 400px;
   overflow: auto;
   padding: 6px 8px;
   /* Needs to be above #footer. */
   z-index: 10;
 }
 
+.footer-menu,
+.footer-menu-context-menu {
+  min-width: 150px;
+}
+
 /* TODO(dubroy): Unify this with tile page scrollbar. */
 .footer-menu::-webkit-scrollbar-button {
   display: none;
 }
 
 .footer-menu::-webkit-scrollbar {
   width: 8px;
 }
 
 .footer-menu::-webkit-scrollbar-thumb {
@@ skipping 40 matching lines @@
 .footer-menu section h3 {
   color: black;
   font-weight: bold;
   margin-bottom: 8px;
 }
 
 .footer-menu section h3:first-of-type {
   margin-top: 4px;
 }
 
+/* Used to add additional details to a section header */
+.footer-menu section h3 .details {
+  color: rgb(151, 156, 160);
+  font-style: italic;
+  font-weight: normal;
+}
+
+.footer-menu section h3 .details:before {
+  content: '\2013';  /* En-dash character. */
+  margin: 0 0.5em;
+}
+
 html[dir='rtl'] .footer-menu-item {
   background: no-repeat 100% 50%;
 }
 
 .recent-window {
   background-image: url('images/closed_window.png');
 }
 
 /* TODO(estade): find a better color for active. */
 .footer-menu-item:active,
 .footer-menu-item:visited,
 .footer-menu-item:link {
   color: hsl(213, 90%, 24%) !important;
 }
 
 .disclosure-triangle {
   -webkit-margin-start: 2px;
   -webkit-mask-image: url('images/disclosure_triangle_mask.png');
   background-color: #7F7F7F;
   display: inline-block;
   height: 9px;
   width: 9px;
 }
+
+.footer-menu-context-menu {
+  /* Needs to be above .footer-menu. */
+  z-index: 11;
+}
+
+.footer-menu hr {
+  background-color: rgb(217, 217, 217);
+  border: 0;
+  height: 1px;
+}