Backed out changeset c28c6de838a2 (bug 1428521) for failing devtools/client/netmonitor/test/browser_net_post-data-01.js. r=backout on a CLOSED TREE

devtools/client/netmonitor/src/assets/styles/NetworkDetailsPanel.css

@@ -159,7 +159,6 @@
   display: block;
   height: 100%;
   flex: 1;
-  overflow-x: auto;
 }
 
 .network-monitor .source-editor-mount {