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

jingle/glue/task_pump.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef JINGLE_GLUE_TASK_PUMP_H_
 #define JINGLE_GLUE_TASK_PUMP_H_
 
 #include <stdint.h>
 
 #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();
 
   ~TaskPump() override;
 
   // rtc::TaskRunner implementation.
   void WakeTasks() override;
   int64_t CurrentTime() override;
 
   // No tasks will be processed after this is called, even if
   // WakeTasks() is called.
   void Stop();
 
  private:
   void CheckAndRunTasks();
 
   bool posted_wake_;
   bool stopped_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   base::WeakPtrFactory<TaskPump> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskPump);
 };
 
 }  // namespace jingle_glue
 
 #endif  // JINGLE_GLUE_TASK_PUMP_H_