Destroy the UserManager after ChromeBrowserMainPartsLinux::PostMainMessageLoopRun

chrome/browser/chromeos/chrome_browser_main_chromeos.cc

Index: chrome/browser/chromeos/chrome_browser_main_chromeos.cc
diff --git a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
index 8c78bce1323821acb9ed4989c971e83404be29f6..54d3b38bf3a8c7d285a1f5c7208a03add6151ea0 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
@@ -872,10 +872,13 @@ void ChromeBrowserMainPartsChromeos::PostMainMessageLoopRun() {
 
   chrome::CloseAsh();
 
-  // Destroy the UserManager after ash has been destroyed.
-  UserManager::Destroy();
-
   ChromeBrowserMainPartsLinux::PostMainMessageLoopRun();
+
+  // Destroy the UserManager after ash has been destroyed and
+  // ChromeBrowserMainPartsLinux::PostMainMessageLoopRun run.  The latter might
+  // trigger MergeSessionThrottle::ShouldShowMergeSessionPage, which requires
+  // the UserManager to exist.
+  UserManager::Destroy();
 }
 
 void ChromeBrowserMainPartsChromeos::PostDestroyThreads() {