Replace scoped_ptr with std::unique_ptr in //media/base.

media/base/audio_pull_fifo_unittest.cc

Index: media/base/audio_pull_fifo_unittest.cc
diff --git a/media/base/audio_pull_fifo_unittest.cc b/media/base/audio_pull_fifo_unittest.cc
index 4f1d98ed5fa2859724bb5d8d5a481c34eebf0f46..b664802dabb0484e78a4292e515a6fe3ff727f5d 100644
--- a/media/base/audio_pull_fifo_unittest.cc
+++ b/media/base/audio_pull_fifo_unittest.cc
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include <memory>
+
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/macros.h"
@@ -81,7 +83,7 @@ class AudioPullFifoTest
 
  protected:
   AudioPullFifo pull_fifo_;
-  scoped_ptr<AudioBus> audio_bus_;
+  std::unique_ptr<AudioBus> audio_bus_;
   int fill_value_;
   int last_frame_delay_;