after crrev.com/c13b16f94e70c76f6dd2fcdade2ab858a65dd8e9 clicking the last notification in the mc (which should dismiss the notification and then the MC) DCHECKs with this stack:
[8710:8710:1107/135625.864724:FATAL:message_center_impl.cc(158)] Check failed: !iterating_.
#0 0x7f4062282d7c base::debug::StackTrace::StackTrace()
#1 0x7f40622a975c logging::LogMessage::~LogMessage()
#2 0x7f405ce29b83 message_center::MessageCenterImpl::SetVisibility()
#3 0x7f405ce2e786 message_center::MessageCenterTray::HideMessageCenterBubble()
#4 0x7f405ce2eae7 message_center::MessageCenterTray::OnMessageCenterChanged()
#5 0x7f405ce2b317 message_center::MessageCenterImpl::RemoveNotificationImmediately()
#6 0x7f405ce2b065 message_center::MessageCenterImpl::RemoveNotification()
#7 0x55d64cca2de3 MessageCenterNotificationManager::CancelById()
Comment 1 by bugdroid1@chromium.org
, Nov 13 2017