Repro: Sign into device.

Expected: Signs in normally.
Actual: DCHECK() crash.

All Chrome OS developers are supposed to be enabling DCHECK()s by default, so this should be fixed ASAP: https://groups.google.com/a/google.com/forum/#!topic/chromeos-ui/IhaLnYGdWVQ

#0  0x0000583636d2c57a in logging::LogMessage::~LogMessage() () at ../../base/logging.cc:874
#1  0x0000583634b50d45 in exo::WMHelper::GetInstance() () at ../../components/exo/wm_helper.cc:28                                                                      
#2  0x0000583639853bb6 in arc::(anonymous namespace)::ArcWindowDelegateImpl::IsInArcAppWindow(aura::Window const*) const () at ../../components/arc/ime/arc_ime_service.cc:57
#3  0x0000583639852257 in arc::ArcImeService::OnWindowFocused(aura::Window*, aura::Window*) () at ../../components/arc/ime/arc_ime_service.cc:245
#4  0x0000583638a80589 in wm::FocusController::SetFocusedWindow(aura::Window*) () at ../../ui/wm/core/focus_controller.cc:259
#5  0x0000583638a7ffcc in wm::FocusController::FocusAndActivateWindow(wm::ActivationChangeObserver::ActivationReason, aura::Window*) () at ../../ui/wm/core/focus_controller.cc:228
#6  0x000058363959604b in ash::Shell::~Shell() () at ../../ash/shell.cc:722
#7  0x0000583639597fde in ash::Shell::~Shell() () at ../../ash/shell.cc:707
#8  0x0000583639a1ba0a in ChromeBrowserMainExtraPartsAsh::PostMainMessageLoopRun() () at ../../build/cros_cache/chrome-sdk/tarballs/eve+11244.0.0+target_toolchain/usr/bin/../include/c++/v1/memory:2321
#9  0x0000583636874a8a in ChromeBrowserMainParts::PostMainMessageLoopRun() () at ../../chrome/browser/chrome_browser_main.cc:1891                    
#10 0x0000583634e22726 in chromeos::ChromeBrowserMainPartsChromeos::PostMainMessageLoopRun() () at ../../chrome/browser/chromeos/chrome_browser_main_chromeos.cc:1128
#11 0x0000583633f92ac6 in content::BrowserMainLoop::ShutdownThreadsAndCleanUp() () at ../../content/browser/browser_main_loop.cc:1032
#12 0x0000583633f95300 in content::BrowserMainRunnerImpl::Shutdown() () at ../../content/browser/browser_main_runner_impl.cc:221
#13 0x0000583633f8ee2b in content::BrowserMain(content::MainFunctionParams const&) () at ../../content/browser/browser_main.cc:49
#14 0x00005836368651f0 in content::ContentMainRunnerImpl::RunServiceManager(content::MainFunctionParams&, bool) () at ../../content/app/content_main_runner_impl.cc:543
#15 0x0000583636865096 in content::ContentMainRunnerImpl::Run(bool) () at ../../content/app/content_main_runner_impl.cc:866
#16 0x000058363686c945 in service_manager::Main(service_manager::MainParams const&) () at ../../services/service_manager/embedder/main.cc:472
#17 0x0000583636863431 in content::ContentMain(content::ContentMainParams const&) () at ../../content/app/content_main.cc:19
#18 0x0000583632d4c69f in ChromeMain () at ../../chrome/app/chrome_main.cc:102
#19 0x00007dd8589a7a94 in __libc_start_main (main=0x583632d4c600 <main>, argc=31, argv=0x7fff0e836608, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff0e8365f8) at ../csu/libc-start.c:308
#20 0x0000583632d4c4c9 in _start ()