geckodriver: Fix serialization of script commands

Source-Repo: https://github.com/mozilla/geckodriver
Source-Revision: ef5f348e195e9e0e379b8a92c840c074956f8536

--HG--
extra : rebase_source : ff82ecc041852e6e252e9bc6815433584a72f7d3

testing/geckodriver/src/marionette.rs

@@ -779,7 +779,11 @@ impl ToMarionette for SwitchToFrameParameters {
 
 impl ToMarionette for JavascriptCommandParameters {
     fn to_marionette(&self) -> WebDriverResult<Json> {
-        Ok(self.to_json())
+        let mut data = self.to_json().as_object().unwrap().clone();
+        data.insert("newSandbox".to_string(), false.to_json());
+        data.insert("specialPowers".to_string(), false.to_json());
+        data.insert("scriptTimeout".to_string(), Json::Null);
+        Ok(Json::Object(data))
     }
 }