Change base::TickClock to a ref counted class.

media/cast/cast_environment.h

 // Copyright 2013 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 MEDIA_CAST_CAST_ENVIRONMENT_H_
 #define MEDIA_CAST_CAST_ENVIRONMENT_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 14 matching lines @@
     // and network IO is performed.
     MAIN,
     // The audio thread is where all send side audio processing is done,
     // primarily encoding / decoding but also re-sampling.
     AUDIO,
     // The video encoder thread is where the video processing is done.
     VIDEO,
   };
 
   CastEnvironment(
-      scoped_ptr<base::TickClock> clock,
+      scoped_refptr<base::TickClock> clock,
       scoped_refptr<base::SingleThreadTaskRunner> main_thread_proxy,
       scoped_refptr<base::SingleThreadTaskRunner> audio_thread_proxy,
       scoped_refptr<base::SingleThreadTaskRunner> video_thread_proxy);
 
   // These are the same methods in message_loop.h, but are guaranteed to either
   // get posted to the MessageLoop if it's still alive, or be deleted otherwise.
-  // They return true iff the thread existed and the task was posted.  Note that
+  // They return true if the thread existed and the task was posted.  Note that
   // even if the task is posted, there's no guarantee that it will run, since
   // the target thread may already have a Quit message in its queue.
   bool PostTask(ThreadId identifier,
                 const tracked_objects::Location& from_here,
                 const base::Closure& task);
 
   bool PostDelayedTask(ThreadId identifier,
                        const tracked_objects::Location& from_here,
                        const base::Closure& task,
                        base::TimeDelta delay);
@@ skipping 15 matching lines @@
 
   bool HasVideoThread() { return video_thread_proxy_.get() ? true : false; }
 
  protected:
   virtual ~CastEnvironment();
 
   // Subclasses may override these.
   scoped_refptr<base::SingleThreadTaskRunner> main_thread_proxy_;
   scoped_refptr<base::SingleThreadTaskRunner> audio_thread_proxy_;
   scoped_refptr<base::SingleThreadTaskRunner> video_thread_proxy_;
-  scoped_ptr<base::TickClock> clock_;
+  scoped_refptr<base::TickClock> clock_;
   scoped_ptr<LoggingImpl> logging_;
 
  private:
   friend class base::RefCountedThreadSafe<CastEnvironment>;
 
   DISALLOW_COPY_AND_ASSIGN(CastEnvironment);
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_CAST_ENVIRONMENT_H_