x11: Unset the X11 error handlers when the message-loop starts getting destroyed.

chrome/browser/chrome_browser_main_x11.cc

Index: chrome/browser/chrome_browser_main_x11.cc
diff --git a/chrome/browser/chrome_browser_main_x11.cc b/chrome/browser/chrome_browser_main_x11.cc
index bc97bce94475a820cbf7c8af613fabb9385e85bd..acd4c80c788f99688f5fca3e5e2889f21ad8fd0e 100644
--- a/chrome/browser/chrome_browser_main_x11.cc
+++ b/chrome/browser/chrome_browser_main_x11.cc
@@ -67,6 +67,14 @@ int BrowserX11IOErrorHandler(Display* d) {
   return 0;
 }
 
+int X11EmptyErrorHandler(Display* d, XErrorEvent* error) {
+  return 0;
+}
+
+int X11EmptyIOErrorHandler(Display* d) {
+  return 0;
+}
+
 }  // namespace
 
 void RecordBreakpadStatusUMA(MetricsService* metrics) {
@@ -93,3 +101,7 @@ void SetBrowserX11ErrorHandlers() {
   // goes away.
   ui::SetX11ErrorHandlers(BrowserX11ErrorHandler, BrowserX11IOErrorHandler);
 }
+
+void UnsetBrowserX11ErrorHandlers() {
+  ui::SetX11ErrorHandlers(X11EmptyErrorHandler, X11EmptyIOErrorHandler);
+}