[Sync] Add option to remove device from "Other devices" on desktop

chrome/browser/resources/history/other_devices.js

Index: chrome/browser/resources/history/other_devices.js
diff --git a/chrome/browser/resources/history/other_devices.js b/chrome/browser/resources/history/other_devices.js
index 2f5b77d30f2aeaef8afb6483f513071bf5ecbd8f..edb99711d802bbd82024278b854f4b0c0f5c9b2c 100644
--- a/chrome/browser/resources/history/other_devices.js
+++ b/chrome/browser/resources/history/other_devices.js
@@ -25,7 +25,8 @@
   EXPAND_SESSION: 7,
   OPEN_ALL: 8,
   HAS_FOREIGN_DATA: 9,
-  LIMIT: 10  // Should always be the last one.
+  HIDE_FOR_NOW: 10,
+  LIMIT: 11  // Should always be the last one.
 };
 
 /**
@@ -69,6 +70,9 @@ DeviceContextMenuController.prototype.initialize = function() {
   this.openAllItem_ = this.appendMenuItem_('restoreSessionMenuItemText');
   this.openAllItem_.addEventListener('activate',
                                      this.onOpenAll_.bind(this));
+  this.deleteItem_ = this.appendMenuItem_('deleteSessionMenuItemText');
+  this.deleteItem_.addEventListener('activate',
+                                    this.onDeleteSession_.bind(this));
 };
 
 /**
@@ -126,6 +130,16 @@ DeviceContextMenuController.prototype.onOpenAll_ = function(e) {
 };
 
 /**
+ * Handler for the 'Hide for now' menu item.
+ * @param {Event} e The activation event.
+ * @private
+ */
+DeviceContextMenuController.prototype.onDeleteSession_ = function(e) {
+  chrome.send('deleteForeignSession', [this.session_.tag]);
+  recordUmaEvent_(HISTOGRAM_EVENT.HIDE_FOR_NOW);
+};
+
+/**
  * Set the visibility of the Expand/Collapse menu items based on the state
  * of the session that this menu is currently associated with.
  * @private