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

media/base/media_log_event.h

Index: media/base/media_log_event.h
diff --git a/media/base/media_log_event.h b/media/base/media_log_event.h
index 51933f3a2a97f616a35b50202ca84577459aaafa..a5427fbd4b87bb5f99a24546c12b8adb520e052f 100644
--- a/media/base/media_log_event.h
+++ b/media/base/media_log_event.h
@@ -6,6 +6,7 @@
 #define MEDIA_BASE_MEDIA_LOG_EVENT_H_
 
 #include <stdint.h>
+#include <memory>
 
 #include "base/time/time.h"
 #include "base/values.h"
@@ -22,7 +23,7 @@ struct MediaLogEvent {
   MediaLogEvent& operator=(const MediaLogEvent& event) {
     id = event.id;
     type = event.type;
-    scoped_ptr<base::DictionaryValue> event_copy(event.params.DeepCopy());
+    std::unique_ptr<base::DictionaryValue> event_copy(event.params.DeepCopy());
     params.Swap(event_copy.get());
     time = event.time;
     return *this;