mash: Fix crashes during chrome teardown.

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 319a0c9017b6509c3070f32b37e08015bf6cd7b6..9921c466d4b7833dbf51274110b6c409dffb22e7 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
@@ -812,7 +812,8 @@ void ChromeBrowserMainPartsChromeos::PostMainMessageLoopRun() {
   power_button_observer_.reset();
   idle_action_warning_observer_.reset();
 
-  MagnificationManager::Shutdown();
+  if (!IsRunningAsMusClient())
+    MagnificationManager::Shutdown();
 
   media::SoundsManager::Shutdown();
 
@@ -849,7 +850,8 @@ void ChromeBrowserMainPartsChromeos::PostMainMessageLoopRun() {
   // Ash needs to be closed before UserManager is destroyed.
   ChromeBrowserMainPartsLinux::PostMainMessageLoopRun();
 
-  AccessibilityManager::Shutdown();
+  if (!IsRunningAsMusClient())
+    AccessibilityManager::Shutdown();
 
   input_method::Shutdown();