ios_chrome_ui_egtests (iPhone 6s Plus iOS 11.0) failing on chromium.mac/ios-simulator-full-configs

Builders failed on: 
- ios-simulator-full-configs: 
  https://build.chromium.org/p/chromium.mac/builders/ios-simulator-full-configs


ios_chrome_ui_egtests (iPhone 7 iOS 11.0) is also failing.


Check failure:
==================================================
[1108/091437.607918:FATAL:tab_model_observers_bridge.mm(209)] Check failed: webState.
0   ios_chrome_ui_egtests               0x00000001026e746d base::debug::StackTrace::StackTrace(unsigned long) + 157
1   ios_chrome_ui_egtests               0x00000001026e74ad base::debug::StackTrace::StackTrace(unsigned long) + 29
2   ios_chrome_ui_egtests               0x00000001026e5f6c base::debug::StackTrace::StackTrace() + 28
3   ios_chrome_ui_egtests               0x000000010274652f logging::LogMessage::~LogMessage() + 479
4   ios_chrome_ui_egtests               0x0000000102744095 logging::LogMessage::~LogMessage() + 21
5   ios_chrome_ui_egtests               0x00000001023cebb4 -[TabModelObserversBridge webStateFaviconChanged:] + 244
6   ios_chrome_ui_egtests               0x00000001023d1806 (anonymous namespace)::FaviconDriverObserverBridge::OnFaviconUpdated(favicon::FaviconDriver*, favicon::FaviconDriverObserver::NotificationIconType, GURL const&, bool, gfx::Image const&) + 454
7   ios_chrome_ui_egtests               0x00000001055fe226 favicon::FaviconDriver::NotifyFaviconUpdatedObservers(favicon::FaviconDriverObserver::NotificationIconType, GURL const&, bool, gfx::Image const&) + 230
8   ios_chrome_ui_egtests               0x0000000101aa8b39 favicon::WebFaviconDriver::OnFaviconUpdated(GURL const&, favicon::FaviconDriverObserver::NotificationIconType, GURL const&, bool, gfx::Image const&) + 681
9   ios_chrome_ui_egtests               0x0000000105606414 favicon::FaviconHandler::NotifyFaviconUpdated(GURL const&, favicon_base::IconType, gfx::Image const&) + 196
10  ios_chrome_ui_egtests               0x00000001056068ed favicon::FaviconHandler::NotifyFaviconUpdated(std::__1::vector<favicon_base::FaviconRawBitmapResult, std::__1::allocator<favicon_base::FaviconRawBitmapResult> > const&) + 461
11  ios_chrome_ui_egtests               0x00000001056060b2 favicon::FaviconHandler::OnFaviconDataForInitialURLFromFaviconService(std::__1::vector<favicon_base::FaviconRawBitmapResult, std::__1::allocator<favicon_base::FaviconRawBitmapResult> > const&) + 322