Convert JsonWriter::Write to taking a const ref for the in-param

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..322f24792b92c10d96f71d11501af01b32804fe7 100644
--- a/media/base/media_log.cc
+++ b/media/base/media_log.cc
@@ -141,7 +141,7 @@ std::string MediaLog::MediaEventToLogString(const MediaLogEvent& event) {
         media::MediaLog::PipelineStatusToString(status);
   }
   std::string params_json;
-  base::JSONWriter::Write(&event.params, &params_json);
+  base::JSONWriter::Write(event.params, &params_json);
   return EventTypeToString(event.type) + " " + params_json;
 }