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

media/base/audio_discard_helper_unittest.cc

Index: media/base/audio_discard_helper_unittest.cc
diff --git a/media/base/audio_discard_helper_unittest.cc b/media/base/audio_discard_helper_unittest.cc
index 692f06576cb2a0165131adc45b08aad90ff9c09d..3763b84004199826973e39b332f1443d2ec94471 100644
--- a/media/base/audio_discard_helper_unittest.cc
+++ b/media/base/audio_discard_helper_unittest.cc
@@ -2,12 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "media/base/audio_discard_helper.h"
+
 #include <stddef.h>
 
-#include "base/memory/scoped_ptr.h"
+#include <memory>
+
 #include "media/base/audio_buffer.h"
 #include "media/base/audio_bus.h"
-#include "media/base/audio_discard_helper.h"
 #include "media/base/decoder_buffer.h"
 #include "media/base/test_helpers.h"
 #include "media/base/timestamp_constants.h"
@@ -42,7 +44,8 @@ static float ExtractDecodedData(const scoped_refptr<AudioBuffer>& buffer,
                                 int index) {
   // This is really inefficient, but we can't access the raw AudioBuffer if any
   // start trimming has been applied.
-  scoped_ptr<AudioBus> temp_bus = AudioBus::Create(buffer->channel_count(), 1);
+  std::unique_ptr<AudioBus> temp_bus =
+      AudioBus::Create(buffer->channel_count(), 1);
   buffer->ReadFrames(1, index, 0, temp_bus.get());
   return temp_bus->channel(0)[0];
 }