Remove excess whitespace and reformat comment

lib/dataconnection.js

@@ -118,10 +118,9 @@ DataConnection.prototype._handleDataMessage = function(e) {
     chunkInfo.count += 1;
 
     if (chunkInfo.total === chunkInfo.count) {
-      
-      // free up memory before making the recursive call to _handleDataMessage()
+      // Clean up before making the recursive call to `_handleDataMessage`.
       delete this._chunkedData[id];
-      
+
       // We've received all the chunks--time to construct the complete data.
       data = new Blob(chunkInfo.data);
       this._handleDataMessage({data: data});