Have content/ create and destroy its own threads.

chrome/browser/ui/gtk/select_file_dialog_impl_kde.cc

Index: chrome/browser/ui/gtk/select_file_dialog_impl_kde.cc
diff --git a/chrome/browser/ui/gtk/select_file_dialog_impl_kde.cc b/chrome/browser/ui/gtk/select_file_dialog_impl_kde.cc
index dac604b73ebd206aefbbcb7a85111b8af3c50994..ca0e2cd65273cf12cd4a7a1d559143152a4f1522 100644
--- a/chrome/browser/ui/gtk/select_file_dialog_impl_kde.cc
+++ b/chrome/browser/ui/gtk/select_file_dialog_impl_kde.cc
@@ -2,8 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include <gdk/gdkx.h>
-#include <gtk/gtk.h>
+#include "content/public/browser/browser_thread.h"
 
 #include <set>
 
@@ -22,6 +21,10 @@
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 
+// These conflict with base/tracked_objects.h, so need to come last.
+#include <gdk/gdkx.h>
+#include <gtk/gtk.h>
+
 using content::BrowserThread;
 
 namespace {