Remove calls to deprecated MessageLoop methods in jingle.

jingle/glue/task_pump.cc

Index: jingle/glue/task_pump.cc
diff --git a/jingle/glue/task_pump.cc b/jingle/glue/task_pump.cc
index f2c769d34b5e2f4804569e5ef71dd39ed007eb35..3f091f2c49c1cc340839187b09a87e33708a2b70 100644
--- a/jingle/glue/task_pump.cc
+++ b/jingle/glue/task_pump.cc
@@ -6,6 +6,7 @@
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
+#include "base/single_thread_task_runner.h"
 #include "jingle/glue/task_pump.h"
 
 namespace jingle_glue {
@@ -26,7 +27,7 @@ void TaskPump::WakeTasks() {
     base::MessageLoop* current_message_loop = base::MessageLoop::current();
     CHECK(current_message_loop);
     // Do the requested wake up.
-    current_message_loop->PostTask(
+    current_message_loop->task_runner()->PostTask(
         FROM_HERE,
         base::Bind(&TaskPump::CheckAndRunTasks, weak_factory_.GetWeakPtr()));
     posted_wake_ = true;