MD History: Hide sign in guide in guest mode

chrome/test/data/webui/md_history/history_synced_tabs_test.js

Index: chrome/test/data/webui/md_history/history_synced_tabs_test.js
diff --git a/chrome/test/data/webui/md_history/history_synced_tabs_test.js b/chrome/test/data/webui/md_history/history_synced_tabs_test.js
index c1b0301d35d54d482cceabd5832e7bfa35362a07..0e4a7144d063d3ca81298fb38820a994c4c491cf 100644
--- a/chrome/test/data/webui/md_history/history_synced_tabs_test.js
+++ b/chrome/test/data/webui/md_history/history_synced_tabs_test.js
@@ -253,6 +253,22 @@ cr.define('md_history.history_synced_tabs_test', function() {
         });
       });
 
+      test('hide sign in promo in guest mode', function() {
+        // Initial state is signed in.
+        element.signInState_ = true;
+        // Turn to guest mode, which is also signed out state.
+        element.guestSession_ = true;
+        updateSignInState(false);
+        return flush().then(function() {
+          assertTrue(element.$['sign-in-guide'].hidden);
+          var noSyncedResults = loadTimeData.getString('noSyncedResults');
+          assertNotEquals(
+              -1,
+              element.$['no-synced-tabs'].textContent.indexOf(noSyncedResults));

[calamity, 2016/07/21 04:56:49]

I think it's enough to just check this is hidden.

[lshang, 2016/07/21 07:09:55]

Done.

+          element.guestSession_ = false;

[calamity, 2016/07/21 04:56:49]

Put this in the teardown?

[lshang, 2016/07/21 07:09:55]

Done.

+        });
+      });
+
       teardown(function() {
         element.syncedDevices = [];
         element.searchedTerm = '';