I think this is a DCHECK failure.

Chrome Version: ToT at 68.0.3404.0 (Developer Build) (64-bit)
OS: Linux

What steps will reproduce the problem?
(1) Start Chrome with a new profile (--user-data-dir=/tmp/blah).
(2) Go to chrome://extensions, load an unpacked extension like chrome/test/data/extensions/api_test/service_worker/background
(3) Restart Chrome with the same profile and command-line-flag --disable

What is the expected result?

Chrome starts up.

What happens instead?

Received signal 11 SEGV_MAPERR 000000000008
#0 0x7fecab3370ec base::debug::StackTrace::StackTrace()
#1 0x7fecab336c51 base::debug::(anonymous namespace)::StackDumpSignalHandler()
#2 0x7fecab3a20c0 <unknown>
#3 0x7fecab331611 base::internal::flat_tree<>::equal_range<>()
#4 0x7fecab32d591 base::DictionaryValue::HasKey()
#5 0x56227d1c55ea extensions::Manifest::GetTypeFromManifestValue()
#6 0x56227c88074f extensions::ExtensionPrefs::InitPrefStore()
#7 0x56227c88156d extensions::ExtensionPrefs::ExtensionPrefs()
#8 0x56227c87a539 extensions::ExtensionPrefs::Create()
#9 0x56227c882e5f extensions::ExtensionPrefsFactory::BuildServiceInstanceFor()
#10 0x7feca6f52bd5 BrowserContextKeyedServiceFactory::BuildServiceInstanceFor()
#11 0x7feca74e3cb5 KeyedServiceFactory::GetServiceForContext()
#12 0x56227c86739f extensions::EventRouterFactory::BuildServiceInstanceFor()
#13 0x7feca6f52bd5 BrowserContextKeyedServiceFactory::BuildServiceInstanceFor()
#14 0x7feca74e3cb5 KeyedServiceFactory::GetServiceForContext()
#15 0x56227c91e406 extensions::CastChannelAPI::CastChannelAPI()
#16 0x56227c920a62 extensions::BrowserContextKeyedAPIFactory<>::BuildServiceInstanceFor()
#17 0x7feca6f52bd5 BrowserContextKeyedServiceFactory::BuildServiceInstanceFor()
#18 0x7feca74e3cb5 KeyedServiceFactory::GetServiceForContext()
#19 0x7feca74e3159 DependencyManager::CreateContextServices()
#20 0x7feca6f522ed BrowserContextDependencyManager::DoCreateBrowserContextServices()
#21 0x56227cc9239d ProfileImpl::OnLocaleReady()
#22 0x56227cc8f659 ProfileImpl::OnPrefsLoaded()
#23 0x56227cc8f44e ProfileImpl::ProfileImpl()
#24 0x56227cc8d8f9 Profile::CreateProfile()
#25 0x56227ccae655 ProfileManager::CreateProfileHelper()
#26 0x56227cca8897 ProfileManager::CreateAndInitializeProfile()
#27 0x56227cca85dc ProfileManager::GetProfile()
#28 0x56227d965e65 GetStartupProfile()
#29 0x56227cb926e0 ChromeBrowserMainParts::PreMainMessageLoopRunImpl()
#30 0x56227cb91e3a ChromeBrowserMainParts::PreMainMessageLoopRun()
#31 0x7feca8e57891 content::BrowserMainLoop::PreMainMessageLoopRun()
#32 0x7feca91ac6f7 content::StartupTaskRunner::RunAllTasksNow()
#33 0x7feca8e5645a content::BrowserMainLoop::CreateStartupTasks()
#34 0x7feca8e5a1a3 content::BrowserMainRunnerImpl::Initialize()
#35 0x7feca8e54044 content::BrowserMain()
#36 0x7feca95ebc48 content::ContentMainRunnerImpl::Run()
#37 0x7fecab76f494 service_manager::Main()
#38 0x7feca95e9d94 content::ContentMain()
#39 0x56227c7681b3 ChromeMain
#40 0x7feca05b92b1 __libc_start_main
#41 0x56227c76802a _start




Please use labels and text to provide additional information.

If this is a regression (i.e., worked before), please consider using the
bisect tool (https://www.chromium.org/developers/bisect-builds-py) to help
us identify the root cause and more rapidly triage the issue.

For graphics-related bugs, please copy/paste the contents of the about:gpu
page at the end of this report.