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

chrome/browser/extensions/api/storage/settings_sync_util.cc

Index: chrome/browser/extensions/api/storage/settings_sync_util.cc
diff --git a/chrome/browser/extensions/api/storage/settings_sync_util.cc b/chrome/browser/extensions/api/storage/settings_sync_util.cc
index c187c52dde6e90d907d3f188617d8862d1bb2da2..ccd9a446635211faed34566618d7783b38e06d58 100644
--- a/chrome/browser/extensions/api/storage/settings_sync_util.cc
+++ b/chrome/browser/extensions/api/storage/settings_sync_util.cc
@@ -30,7 +30,7 @@ void PopulateExtensionSettingSpecifics(
   specifics->set_key(key);
   {
     std::string value_as_json;
-    base::JSONWriter::Write(&value, &value_as_json);
+    base::JSONWriter::Write(value, &value_as_json);
     specifics->set_value(value_as_json);
   }
 }