Implement a poor man's PostAfterStartupTask() function.

content/public/browser/browser_thread.h

Index: content/public/browser/browser_thread.h
diff --git a/content/public/browser/browser_thread.h b/content/public/browser/browser_thread.h
index b3b42290978dab0f36a375591b388a643ab57df9..e8528ff2f49a7ba79e65cf63ade60f06971ca416 100644
--- a/content/public/browser/browser_thread.h
+++ b/content/public/browser/browser_thread.h
@@ -184,6 +184,11 @@ class CONTENT_EXPORT BrowserThread {
       const tracked_objects::Location& from_here,
       const base::Closure& task);
 
+  static void PostAfterStartupTask(
+      const tracked_objects::Location& from_here,
+      const scoped_refptr<base::TaskRunner>& task_runner,
+      const base::Closure& task);
+
   // Returns the thread pool used for blocking file I/O. Use this object to
   // perform random blocking operations such as file writes or querying the
   // Windows registry.