[issues] Gate surfacing of issues panel behind experiment

Bug: chromium:1057979
Change-Id: Ibcdbdd14158a4a3248d8ec017baf8f6b50465819
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2190338
Reviewed-by: Simon Zünd <[email protected]>
Commit-Queue: Sigurd Schneider <[email protected]>
diff --git a/front_end/network/RequestHeadersView.js b/front_end/network/RequestHeadersView.js
index c702ca3..7bb5c14 100644
--- a/front_end/network/RequestHeadersView.js
+++ b/front_end/network/RequestHeadersView.js
@@ -32,6 +32,7 @@
 import * as Common from '../common/common.js';
 import * as Host from '../host/host.js';
 import * as ObjectUI from '../object_ui/object_ui.js';
+import * as Root from '../root/root.js';
 import * as SDK from '../sdk/sdk.js';
 import * as UI from '../ui/ui.js';