[iOS] Reenable CallLoadURLWithParamsDuringSessionRestore

WKWebView was quite a lot crashy on iOS 13.1. It is possible that this
instability was making this test flaky.
As the bots were updated to iOS 13.3, it should be possible to
re-enable this test.

Fixed: 1046576
Change-Id: I694daecb4c320bcd13dad12d27a1fa64bc0207e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2047065
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Auto-Submit: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740345}

ios/web/web_state/web_state_unittest.mm

@@ -434,11 +434,6 @@ TEST_F(WebStateTest, CallStopDuringSessionRestore) {
 // Verifies that calling NavigationManager::LoadURLWithParams() does not stop
 // the session restoration and eventually loads the requested URL.
 TEST_F(WebStateTest, CallLoadURLWithParamsDuringSessionRestore) {
-  if (@available(iOS 13.1, *)) {
-    // TODO(crbug.com/1046576): this test is flaky on iOS 13.1.
-    return;
-  }
-
   // Create session storage with large number of items.
   const int kItemCount = 10;
   NSMutableArray<CRWNavigationItemStorage*>* item_storages =