[ios] Increases wait time for TestInfobarBannerNotPresentAfterWebStateChange

Bug: 993962
Change-Id: Iaa4ada2faf2384a4bdb142756bece266d80fddd6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1761297
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Peter Lee <pkl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688591}

ios/chrome/browser/ui/infobars/infobar_container_coordinator_unittest.mm

@@ -374,8 +374,11 @@ TEST_F(InfobarContainerCoordinatorTest,
             InfobarBannerPresentationState::Presented);
 
   web_state_list_->ActivateWebStateAt(0);
-  // Wait for any potential presentation.
-  base::test::ios::SpinRunLoopWithMinDelay(base::TimeDelta::FromSecondsD(1));
+  // Wait for any potential presentation. This value was initially 1 second but
+  // started to cause Flake on iOS13, this seems to be fixed when we change it
+  // to 2 seconds. If this happens again with a different iOS version or device,
+  // etc. or the test keeps flaking, then it should probably be redesigned.
+  base::test::ios::SpinRunLoopWithMinDelay(base::TimeDelta::FromSecondsD(2));
 
   ASSERT_NE(infobar_container_coordinator_.infobarBannerState,
             InfobarBannerPresentationState::Presented);