Bug 1593921 - Use eslint-disable-next-line to disable complexity checks in DevTools r=pbro

Using next-line is less error prone for refactorings than wrapping methods with enable/disable blocks.

Differential Revision: https://phabricator.services.mozilla.com/D51782

devtools/shared/DevToolsUtils.js

@@ -562,7 +562,7 @@ function mainThreadFetch(
       ).loadGroup;
     }
 
-    /* eslint-disable complexity */
+    // eslint-disable-next-line complexity
     const onResponse = (stream, status, request) => {
       if (!components.isSuccessCode(status)) {
         reject(new Error(`Failed to fetch ${url}. Code ${status}.`));