Allow overriding of X error functions

chrome/browser/browser_shutdown.cc

Index: chrome/browser/browser_shutdown.cc
diff --git a/chrome/browser/browser_shutdown.cc b/chrome/browser/browser_shutdown.cc
index 7268404372c77e2ff42b809eff6e9a995f302669..78241492c03f630737d15321d31bb8aaa8955c3a 100644
--- a/chrome/browser/browser_shutdown.cc
+++ b/chrome/browser/browser_shutdown.cc
@@ -289,4 +289,12 @@ bool IsTryingToQuit() {
   return g_trying_to_quit;
 }
 
+bool ShuttingDownWithoutClosingBrowsers() {
+#if defined(USE_X11)
+  if (GetShutdownType() == browser_shutdown::END_SESSION)
+    return true;
+#endif
+  return false;
+}
+
 }  // namespace browser_shutdown