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 c89c4151fb6c1bb4e202ed89ad71ae47dc778965..462299be55c97f3dec3745391955113f74a8d0b1 100644
--- a/media/base/media_log.cc
+++ b/media/base/media_log.cc
@@ -139,7 +139,7 @@ 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;
 }