Have content/ create and destroy its own threads.

chrome/browser/chromeos/login/webui_screen_locker.cc

Index: chrome/browser/chromeos/login/webui_screen_locker.cc
diff --git a/chrome/browser/chromeos/login/webui_screen_locker.cc b/chrome/browser/chromeos/login/webui_screen_locker.cc
index 4294eebde7ec2ff6f1ce5d192798880296cfb24d..a6798c7e1c246c550d6f49ddfbee7a4c7761e05c 100644
--- a/chrome/browser/chromeos/login/webui_screen_locker.cc
+++ b/chrome/browser/chromeos/login/webui_screen_locker.cc
@@ -4,15 +4,6 @@
 
 #include "chrome/browser/chromeos/login/webui_screen_locker.h"
 
-#include <X11/extensions/XTest.h>
-#include <X11/keysym.h>
-#include <gdk/gdkkeysyms.h>
-#include <gdk/gdkx.h>
-
-// Evil hack to undo X11 evil #define.
-#undef None
-#undef Status
-
 #include "base/command_line.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
@@ -35,6 +26,12 @@
 #include "ui/gfx/screen.h"
 #include "ui/views/widget/native_widget_gtk.h"
 
+// These conflict with some of the Chrome headers, so must be included last.
+#include <X11/extensions/XTest.h>
+#include <X11/keysym.h>
+#include <gdk/gdkkeysyms.h>
+#include <gdk/gdkx.h>
+
 namespace {
 
 // URL which corresponds to the login WebUI.