Chrome Version: 58.0.3026.0

Repro:
1. Build unit_tests target w/ components, and Debug.
2. Run unit_tests --test-launcher-retry-limit=0

Result:

Lots of test failures looking like:

[ RUN      ] ExtensionServiceTest.ExternalInstallPrefUpdateUrl
[31186:31186:0227/101848.738044:2835942338993:FATAL:extension_garbage_collector.cc(150)] Check failed: !content::BrowserThread::CurrentlyOn(content::BrowserThread::UI). 
#0 0x7f3a493868cb base::debug::StackTrace::StackTrace()
#1 0x7f3a49384f5c base::debug::StackTrace::StackTrace()
#2 0x7f3a493f329f logging::LogMessage::~LogMessage()
#3 0x00000564166b extensions::ExtensionGarbageCollector::GarbageCollectExtensionsOnFileThread()
...