Fix crash on shutdown from lock screen

On lock screen, click shutdown.

Stack:

#0 0x56392661eb8c base::debug::StackTrace::StackTrace()
#1 0x56392663263c logging::LogMessage::~LogMessage()
#2 0x56392521a9ba content::RenderProcessHostImpl::RenderProcessHostImpl()
#3 0x56392521a295 content::RenderProcessHostImpl::CreateRenderProcessHost()
#4 0x56392521a3a8 content::RenderProcessHostImpl::CreateOrUseSpareRenderProcessHost()
#5 0x563925227b71 content::RenderProcessHostImpl::GetProcessHostForSiteInstance()
#6 0x5639252dc6d3 content::SiteInstanceImpl::GetProcess()
#7 0x5639253098f0 content::WebContentsImpl::Init()
#8 0x5639252ff5b8 content::WebContentsImpl::CreateWithOpener()
#9 0x5639252ff338 content::WebContents::Create()
#10 0x5639289187d6 views::WebView::CreateWebContents()
#11 0x56392891870a views::WebView::GetWebContents()
#12 0x563925751b3a ChromeVoxPanel::ChromeVoxPanel()
#13 0x56392574ed36 chromeos::AccessibilityManager::ReloadChromeVoxPanel()
#14 0x563928581f73 session_manager::SessionManager::SetSessionState()
#15 0x5639258868ae chromeos::ScreenLocker::~ScreenLocker()
#16 0x563925886a7e chromeos::ScreenLocker::~ScreenLocker()
#17 0x563925886337 chromeos::ScreenLocker::ScheduleDeletion()
#18 0x5639257e27fa chromeos::ChromeBrowserMainPartsChromeos::PostMainMessageLoopRun()
#19 0x563924faee88 content::BrowserMainLoop::ShutdownThreadsAndCleanUp()
#20 0x563924fb17cf content::BrowserMainRunnerImpl::Shutdown()
#21 0x563924faaec8 content::BrowserMain()
#22 0x56392635a7a5 content::ContentMainRunnerImpl::Run()
#23 0x5639263625f6 service_manager::Main()
#24 0x563926359344 content::ContentMain()
#25 0x5639247fd386 ChromeMain
#26 0x7f2fdc2c9f45 __libc_start_main


Bug: 
Change-Id: I2ff90d96c9bf1254625f098e004d9b3a7d272c10
Reviewed-on: https://chromium-review.googlesource.com/838180
Commit-Queue: David Tseng <[email protected]>
Reviewed-by: Dominic Mazzoni <[email protected]>
Cr-Commit-Position: refs/heads/master@{#525895}
1 file changed