Rollback unnecessary change which drops coverage

Check if process.stdout is available was added based on xunit reporter example. However this branch is not covered by test and previously this was not present in json reporter nor json-stream reporter.

lib/reporters/json.js

@@ -82,10 +82,8 @@ function JSONReporter(runner, options) {
     if (output) {
       fs.mkdirSync(path.dirname(output), {recursive: true});
       fs.writeFileSync(output, json);
-    } else if (typeof process === 'object' && process.stdout) {
-      process.stdout.write(json);
     } else {
-      Base.consoleLog(json);
+      process.stdout.write(json);
     }
   });
 }