Change var blah_blah -> blahBlah.

chrome/browser/resources/sync_internals/traffic.js

Index: chrome/browser/resources/sync_internals/traffic.js
diff --git a/chrome/browser/resources/sync_internals/traffic.js b/chrome/browser/resources/sync_internals/traffic.js
index 047c36969097ae8bd153ae18d40c5d0104817212..2e56fb53085b6647d1f1a2f408b0eccf60f2c0a5 100644
--- a/chrome/browser/resources/sync_internals/traffic.js
+++ b/chrome/browser/resources/sync_internals/traffic.js
@@ -10,13 +10,13 @@
 });
 
 function printData(trafficRecord) {
-  var traffic_data = '';
-  traffic_data += '===\n';
-  traffic_data += 'Client Server Traffic\n';
-  traffic_data += '===\n';
-  traffic_data += JSON.stringify(trafficRecord, null, 2);
-  traffic_data += '\n';
+  var trafficData = '';
+  trafficData += '===\n';
+  trafficData += 'Client Server Traffic\n';
+  trafficData += '===\n';
+  trafficData += JSON.stringify(trafficRecord, null, 2);
+  trafficData += '\n';
 
-  trafficDump.textContent = traffic_data;
+  trafficDump.textContent = trafficData;
 }
 })();