fix propagating protocol fetch errors when using stdio pipes (the callback-based

implementation doesn't correctly transform the cdp errors)

Author: kevzoid

lib/devtools.js

@@ -51,11 +51,9 @@ function Protocol(options, callback) {
     // fetch remotely via CDP when using stdio pipes (Bright Data exclusive)
     if (options.cdp)
     {
-        return options.cdp.send('Browser.getProtocolJson', (err, data)=>{
-            if (err)
-                return callback(err);
-            callback(null, JSON.parse(data.result));
-        });
+        return options.cdp.send('Browser.getProtocolJson')
+            .then(data=>callback(null, JSON.parse(data.result)))
+            .catch(callback)
     }
     // if the local protocol is requested
     if (options.local) {