Bug 1359065 - Remove timeStamp before generating message ID; r=nchevobbe

MozReview-Commit-ID: HGaQsIkb7IG

--HG--
extra : rebase_source : 57c5d9145e4818d8d069c641146dbf6547c78518

devtools/client/webconsole/new-console-output/utils/messages.js

@@ -231,7 +231,8 @@ function transformPacket(packet) {
 // Helpers
 function getRepeatId(message) {
   message = message.toJS();
-  delete message.repeat;
+  message.repeat = null;
+  message.timeStamp = null;
   return JSON.stringify(message);
 }