Not sure if this was already filed CJ, I'm seeing an error on shutdown on the engine. Looks like the weakptrs for the EngineGeolocationFeature are not being invalidated on the correct thread,

[23894:23894:0906/151656:FATAL:weak_ptr.cc(20)] Check failed: sequence_checker_.CalledOnValidSequence() || HasOneRef(). WeakPtrs must be invalidated on the same sequenced thread.
#0 0x7fd27c1aed5e base::debug::StackTrace::StackTrace()
#1 0x7fd27c2159cf logging::LogMessage::~LogMessage()
#2 0x7fd27c22db68 base::internal::WeakReference::Flag::Invalidate()
#3 0x7fd27c22ded4 base::internal::WeakReferenceOwner::Invalidate()
#4 0x7fd27c22de89 base::internal::WeakReferenceOwner::~WeakReferenceOwner()
#5 0x00000043babd base::WeakPtrFactory<>::~WeakPtrFactory()
#6 0x00000048cefc blimp::engine::EngineGeolocationFeature::~EngineGeolocationFeature()
#7 0x0000004c7d57 blimp::engine::BlimpEngineSession::~BlimpEngineSession()
#8 0x0000004c7eb9 blimp::engine::BlimpEngineSession::~BlimpEngineSession()
#9 0x000000428d5f std::default_delete<>::operator()()
#10 0x00000042864c std::unique_ptr<>::reset()
#11 0x00000042819d blimp::engine::BlimpBrowserMainParts::PostMainMessageLoopRun()
#12 0x7fd278e38ac8 content::BrowserMainLoop::ShutdownThreadsAndCleanUp()
#13 0x7fd278e427a3 content::BrowserMainRunnerImpl::Shutdown()
#14 0x7fd278e32665 content::BrowserMain()
#15 0x7fd27aa415d6 content::RunNamedProcessTypeMain()
#16 0x7fd27aa438c2 content::ContentMainRunnerImpl::Run()
#17 0x7fd27aa40692 content::ContentMain()
#18 0x000000427d25 main
#19 0x7fd26f923f45 __libc_start_main
#20 0x000000427bf5 <unknown>