PopupsOnlyUiDelegateTest.WebNotificationPopupBubble browser_tests failing on chromium.linux/Linux Tests (dbg)(1)(32)

Builders failed on: 
- Linux Tests (dbg)(1)(32): 
  https://build.chromium.org/p/chromium.linux/builders/Linux%20Tests%20%28dbg%29%281%29%2832%29

fyi:
[ RUN      ] PopupsOnlyUiDelegateTest.WebNotificationPopupBubble
../../chrome/browser/ui/views/message_center/popups_only_ui_delegate_browsertest.cc:125: Failure
Value of: delegate->GetUiControllerForTesting()->popups_visible()
  Actual: false
Expected: true
../../chrome/browser/ui/views/message_center/popups_only_ui_delegate_browsertest.cc:130: Failure
Value of: delegate->GetUiControllerForTesting()->popups_visible()
  Actual: false
Expected: true
../../chrome/browser/ui/views/message_center/popups_only_ui_delegate_browsertest.cc:134: Failure
Value of: delegate->GetUiControllerForTesting()->popups_visible()
  Actual: false
Expected: true