Bug 946320 - Followup, remove all logins after disabling sync. r=me

--HG--
extra : rebase_source : 1a0da944bb2cde11e899b78b2421ab87837553d2

browser/components/customizableui/test/browser_946320_tabs_from_other_computers.js

@@ -43,6 +43,7 @@ add_task(function() {
 
   let syncPrefBranch = new Preferences("services.sync.");
   syncPrefBranch.resetBranch("");
+  Services.logins.removeAllLogins();
 
   let hiddenPanelPromise = promisePanelHidden(window);
   PanelUI.toggle({type: "command"});