A number of win_chromium_rel_ng runs have had to rebuild to retry after this test fails.

Sample trybot runs:
https://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_ng/builds/293749
https://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_ng/builds/293793
https://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_ng/builds/293795

Log output:

[ RUN      ] SitePerProcessInteractiveBrowserTest.FullscreenElementInSubframe
[7048:3948:0915/061716:ERROR:interface_registry.cc(99)] Failed to locate a binder for interface: dom_distiller::mojom::DistillabilityService
[7048:3948:0915/061716:WARNING:render_frame_host_impl.cc(2059)] OnDidStopLoading was called twice.
[7048:1724:0915/061716:WARNING:embedded_test_server.cc(202)] Request not handled. Returning 404: /favicon.ico
[7048:3948:0915/061716:ERROR:interface_registry.cc(99)] Failed to locate a binder for interface: dom_distiller::mojom::DistillabilityService
[7048:3948:0915/061717:FATAL:cross_process_frame_connector.cc(150)] Check failed: false.
Backtrace:
	base::debug::StackTrace::StackTrace [0x024BFBF7+23]
	logging::LogMessage::~LogMessage [0x02451D01+49]
	content::CrossProcessFrameConnector::TransformPointToLocalCoordSpace [0x016FCF05+172]
	content::RenderWidgetHostViewChildFrame::TransformPointToLocalCoordSpace [0x01724ADD+49]
	content::DelegatedFrameHost::TransformPointToCoordSpaceForView [0x01910D7F+54]
	content::RenderWidgetHostViewAura::TransformPointToCoordSpaceForView [0x01839813+23]
	content::RenderWidgetHostInputEventRouter::SendMouseEnterOrLeaveEvents [0x018342BE+611]
	content::RenderWidgetHostInputEventRouter::RouteMouseEvent [0x018337FC+151]
	content::RenderWidgetHostViewAura::OnMouseEvent [0x01837FF9+1204]
	ui::EventHandler::OnEvent [0x02761DE9+41]
	ui::EventDispatcher::DispatchEvent [0x02765564+61]
	ui::EventDispatcher::ProcessEvent [0x0276588F+142]
	ui::EventDispatcherDelegate::DispatchEventToTarget [0x0276576E+42]
	ui::EventDispatcherDelegate::DispatchEvent [0x0276560B+135]
	ui::EventProcessor::OnEventFromSource [0x02766774+304]
	ui::EventSource::DeliverEventToProcessor [0x027663BE+80]
	ui::EventSource::SendEventToProcessor [0x0276649F+214]
	views::DesktopWindowTreeHostWin::HandleScrollEvent [0x02427216+20]
	views::HWNDMessageHandler::HandleMouseEventInternal [0x024392C7+752]
	views::HWNDMessageHandler::HandleMouseMessage [0x024395A4+45]
	content::LegacyRenderWidgetHostHWND::OnMouseRange [0x017EF2C0+215]
	content::LegacyRenderWidgetHostHWND::_ProcessWindowMessage [0x017EF7CE+196]
	content::LegacyRenderWidgetHostHWND::ProcessWindowMessage [0x017EF500+33]
	ATL::CWindowImplBaseT<ATL::CWindow,ATL::CWinTraits<1073741824,0> >::WindowProc [0x017EF65E+72]
	gapfnScSendMessage [0x759262FA+818]
	GetThreadDesktop [0x75926D3A+215]
	CharPrevW [0x759277C4+312]
	DispatchMessageW [0x7592788A+15]
	base::MessagePumpForUI::ProcessMessageHelper [0x024CCE27+199]
	base::MessagePumpForUI::DoRunLoop [0x024CC4A1+65]
	base::MessagePumpWin::Run [0x024CD18A+74]
	base::MessageLoop::RunHandler [0x0245FD47+103]
	base::RunLoop::Run [0x0246F859+41]
	content::RunThisRunLoop [0x01F84C3F+49]
	content::MessageLoopRunner::Run [0x01F84A44+105]
	content::ExecuteScriptAndExtractString [0x01F856A1+286]
	content::ExecuteScript [0x01F8543C+52]
	SitePerProcessInteractiveBrowserTest_FullscreenElementInSubframe_Test::RunTestOnMainThread [0x00C15A76+2306]

I don't see an obvious culprit CL, so I'm going to disable the test (https://codereview.chromium.org/2341123002) and assign some people who've touched the code recently.