[workspace] Don't create IgnoreListManager lazily

It's not necessary so only create a new instance when 'forceNew' is
provided explicitly.

[email protected]

Bug: 458180550
Change-Id: Ibce92c620f8c082b19724e0b52d33afceab2f289
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/7147062
Reviewed-by: Philip Pfaffe <[email protected]>
Commit-Queue: Simon Zünd <[email protected]>
Auto-Submit: Simon Zünd <[email protected]>

Author: szuend

front_end/models/workspace/IgnoreListManager.ts

@@ -88,7 +88,7 @@ export class IgnoreListManager extends Common.ObjectWrapper.ObjectWrapper<EventT
     forceNew: null,
   }): IgnoreListManager {
     const {forceNew} = opts;
-    if (!Root.DevToolsContext.globalInstance().has(IgnoreListManager) || forceNew) {
+    if (forceNew) {
       Root.DevToolsContext.globalInstance().set(
           IgnoreListManager,
           new IgnoreListManager(