Replace deprecated base::NonThreadSafe in jingle in favor of SequenceChecker.

jingle/glue/task_pump.h

Index: jingle/glue/task_pump.h
diff --git a/jingle/glue/task_pump.h b/jingle/glue/task_pump.h
index 4f9c28ca5e73d8e9d20abac2d526bbfdec75288e..64325d0c8ba902efd119daf924e5182a07c84794 100644
--- a/jingle/glue/task_pump.h
+++ b/jingle/glue/task_pump.h
@@ -10,13 +10,13 @@
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 #include "third_party/libjingle_xmpp/task_runner/taskrunner.h"
 
 namespace jingle_glue {
 
 // rtc::TaskRunner implementation that works on chromium threads.
-class TaskPump : public rtc::TaskRunner, public base::NonThreadSafe {
+class TaskPump : public rtc::TaskRunner {
  public:
   TaskPump();
 
@@ -36,6 +36,8 @@ class TaskPump : public rtc::TaskRunner, public base::NonThreadSafe {
   bool posted_wake_;
   bool stopped_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   base::WeakPtrFactory<TaskPump> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskPump);