I installed a local build (at r430922) as canary and got this DCHECK when the uninstaller launched Chrome to show the uninstall prompt (chrome.exe --uninstall):

[6472:3396:1110/110048:FATAL:sequenced_worker_pool.cc(1447)] Check failed: AllPoolsState::NONE_ACTIVE == subtle::NoBarrier_Load(&g_all_pools_state) (0 vs. 1)
Backtrace:
	base::debug::StackTrace::StackTrace [0x1007C287+23] (c:\src\chromium\src\base\debug\stack_trace_win.cc:214)
	logging::LogMessage::~LogMessage [0x100CDEDB+59] (c:\src\chromium\src\base\logging.cc:533)
	base::SequencedWorkerPool::RedirectToTaskSchedulerForProcess [0x1022F307+311] (c:\src\chromium\src\base\threading\sequenced_worker_pool.cc:1448)
	`anonymous namespace'::MaybeInitializeTaskScheduler [0x03FBAA88+520] (c:\src\chromium\src\chrome\browser\chrome_browser_main.cc:340)
	ChromeBrowserMainParts::PreCreateThreadsImpl [0x03FBCB25+4053] (c:\src\chromium\src\chrome\browser\chrome_browser_main.cc:1246)
	ChromeBrowserMainParts::PreCreateThreads [0x03FBB8A2+178] (c:\src\chromium\src\chrome\browser\chrome_browser_main.cc:955)
	ChromeBrowserMainPartsWin::PreCreateThreads [0x03C6E97B+27] (c:\src\chromium\src\chrome\browser\chrome_browser_main_win.cc:292)
	content::BrowserMainLoop::PreCreateThreads [0x116A9ADA+234] (c:\src\chromium\src\content\browser\browser_main_loop.cc:742)
	base::internal::FunctorTraits<int (__thiscall content::BrowserMainLoop::*)(void),void>::Invoke<content::BrowserMainLoop *> [0x1169F772+18] (c:\src\chromium\src\base\bind_internal.h:215)
	base::internal::InvokeHelper<0,int>::MakeItSo<int (__thiscall content::BrowserMainLoop::*const &)(void),content::BrowserMainLoop *> [0x1169FC14+36] (c:\src\chromium\src\base\bind_internal.h:285)
	base::internal::Invoker<base::internal::BindState<int (__thiscall content::BrowserMainLoop::*)(void),base::internal::UnretainedWrapper<content::BrowserMainLoop> >,int __cdecl(void)>::RunImpl<int (__thiscall content::BrowserMainLoop::*const &)(void),std::t [0x116A001B+59] (c:\src\chromium\src\base\bind_internal.h:361)
	base::internal::Invoker<base::internal::BindState<int (__thiscall content::BrowserMainLoop::*)(void),base::internal::UnretainedWrapper<content::BrowserMainLoop> >,int __cdecl(void)>::Run [0x116AA2F4+36] (c:\src\chromium\src\base\bind_internal.h:339)
	base::internal::RunMixin<base::Callback<int __cdecl(void),1,1> >::Run [0x11E1169F+63] (c:\src\chromium\src\base\callback.h:64)
	content::StartupTaskRunner::RunAllTasksNow [0x1234376E+110] (c:\src\chromium\src\content\browser\startup_task_runner.cc:45)
	content::BrowserMainLoop::CreateStartupTasks [0x116A6449+569] (c:\src\chromium\src\content\browser\browser_main_loop.cc:852)
	content::BrowserMainRunnerImpl::Initialize [0x116AFD3E+958] (c:\src\chromium\src\content\browser\browser_main_runner.cc:141)
	content::BrowserMain [0x1169C86F+95] (c:\src\chromium\src\content\browser\browser_main.cc:42)
	content::RunNamedProcessTypeMain [0x1300BB37+135] (c:\src\chromium\src\content\app\content_main_runner.cc:408)
	content::ContentMainRunnerImpl::Run [0x1300B9F8+488] (c:\src\chromium\src\content\app\content_main_runner.cc:776)
	content::ContentMain [0x13009914+100] (c:\src\chromium\src\content\app\content_main.cc:20)
	ChromeMain [0x02B572D8+264] (c:\src\chromium\src\chrome\app\chrome_main.cc:108)
	MainDllLoader::Launch [0x0042E476+918] (c:\src\chromium\src\chrome\app\main_dll_loader_win.cc:174)
	wWinMain [0x0042918E+558] (c:\src\chromium\src\chrome\app\chrome_exe_main_win.cc:249)
	invoke_main [0x004DBF3E+30] (f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:118)
	__scrt_common_main_seh [0x004DBDA0+336] (f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:253)
	__scrt_common_main [0x004DBC3D+13] (f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:296)
	wWinMainCRTStartup [0x004DBF58+8] (f:\dd\vctools\crt\vcstartup\src\startup\exe_wwinmain.cpp:17)
	BaseThreadInitThunk [0x76A162C4+36]
	RtlSubscribeWnfStateChangeNotification [0x77670719+1081]
	RtlSubscribeWnfStateChangeNotification [0x776706E4+1028]