Revert of media-internals: Simplify the code path for creating a media log entry

media/base/media_log.cc

Index: media/base/media_log.cc
diff --git a/media/base/media_log.cc b/media/base/media_log.cc
index b32942daa05cd2e66b639a647933dab7aa7d6c93..745957d5c0cae3befbcb0a75ca416ea4fb18b4e4 100644
--- a/media/base/media_log.cc
+++ b/media/base/media_log.cc
@@ -236,10 +236,13 @@
   return event.Pass();
 }
 
-void MediaLog::AddLogEvent(MediaLogLevel level, const std::string& message) {
-  scoped_ptr<MediaLogEvent> event(CreateEvent(MediaLogLevelToEventType(level)));
-  event->params.SetString(MediaLogLevelToString(level), message);
-  AddEvent(event.Pass());
+scoped_ptr<MediaLogEvent> MediaLog::CreateLogEvent(MediaLogLevel level,
+                                                   const std::string& message) {
+  const MediaLogEvent::Type type = MediaLogLevelToEventType(level);
+  const std::string param = MediaLogLevelToString(level);
+  scoped_ptr<MediaLogEvent> event(CreateEvent(type));
+  event->params.SetString(param, message);
+  return event.Pass();
 }
 
 void MediaLog::SetStringProperty(