Replace the remaining scoped_ptr with unique_ptr in webrtc/modules/

BUG=webrtc:5520

Review URL: https://codereview.webrtc.org/1921233002

Cr-Commit-Position: refs/heads/master@{#12511}

webrtc/modules/audio_coding/neteq/decoder_database.h

@@ -12,6 +12,7 @@
 #define WEBRTC_MODULES_AUDIO_CODING_NETEQ_DECODER_DATABASE_H_
 
 #include <map>
+#include <memory>
 #include <string>
 
 #include "webrtc/base/constructormagic.h"

webrtc/modules/audio_coding/neteq/neteq.cc

@@ -10,6 +10,7 @@
 
 #include "webrtc/modules/audio_coding/neteq/include/neteq.h"
 
+#include <memory>
 #include <sstream>
 
 #include "webrtc/modules/audio_coding/neteq/accelerate.h"

webrtc/modules/audio_coding/neteq/neteq_impl_unittest.cc

@@ -8,6 +8,8 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
+#include <memory>
+
 #include "webrtc/modules/audio_coding/neteq/include/neteq.h"
 #include "webrtc/modules/audio_coding/neteq/neteq_impl.h"
 

webrtc/modules/audio_coding/neteq/tick_timer_unittest.cc

@@ -8,6 +8,8 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
+#include <memory>
+
 #include "webrtc/modules/audio_coding/neteq/tick_timer.h"
 
 #include "testing/gmock/include/gmock/gmock.h"