M59 beta 59.0.3071.61
macOS 10.12.x

I'm seeing this dumped on the console relatively frequently:

[25566:775:0524/114702.107221:ERROR:render_widget_host_view_base.cc(141)] Not implemented reached in virtual bool content::RenderWidgetHostViewBase::IsInVR() const

We shouldn't have this kind of log spew in beta channel. I assume since this is in RWHVBase that it's cross-platform, maybe someone else can confirm.