MD History: Update sign in state in data source

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 2ba6f76f246f08eecd50052be2461b93a57c2ee6..62d817f6a885ad3510e26d25a14f37f62a66e9e2 100644
--- a/chrome/browser/resources/history/other_devices.js
+++ b/chrome/browser/resources/history/other_devices.js
@@ -585,6 +585,8 @@ function load() {
   $('search-field').addEventListener('search', doSearch);
   $('search-button').addEventListener('click', doSearch);
 
+  cr.addWebUIListener('sign-in-state-updated', updateSignInState);
+
   chrome.send('otherDevicesInitialized');
 }