There is a potential memory leak that worth investigating.
It's related to:  payments::PaymentRequestState

We received a slow-reports showing 331709 lives objects.
We are seeing a potential memory leaks with the following stackframe:

base::debug::StackTrace::StackTrace(unsigned int)
profiling::AllocatorShimLogAlloc(profiling::AllocatorType,void *,unsigned int,char const *)
profiling::`anonymous namespace'::HookAlloc
malloc
operator new(unsigned int)
base::BindOnce<void ( payments::PaymentRequestState::*)(void),base::WeakPtr<payments::PaymentRequestState> >(void ( payments::PaymentRequestState::*&&)(void),base::WeakPtr<payments::PaymentRequestState> &&)
content::LevelDBWrapperImpl::StartCommitTimer()
base::internal::InvokeHelper<1,void>::MakeItSo<void ( subresource_filter::RulesetService::*const &)(void),base::WeakPtr<subresource_filter::RulesetService> const &>(void ( subresource_filter::RulesetService::*const &)(void),base::WeakPtr<subresource_filter::RulesetService> const &)
base::internal::Invoker<base::internal::BindState<void ( subresource_filter::RulesetService::*)(void),base::WeakPtr<subresource_filter::RulesetService> >,void >::Run(base::internal::BindStateBase *)
base::debug::TaskAnnotator::RunTask(char const *,base::PendingTask *)
base::MessageLoop::RunTask(base::PendingTask *)
base::MessageLoop::DeferOrRunPendingTask(base::PendingTask)
base::MessageLoop::DoWork()
base::MessagePumpForIO::DoRunLoop()
base::MessagePumpWin::Run(base::MessagePump::Delegate *)
base::RunLoop::Run()
base::Thread::Run(base::RunLoop *)
content::BrowserThreadImpl::IOThreadRun(base::RunLoop *)
content::BrowserThreadImpl::Run(base::RunLoop *)
base::Thread::ThreadMain()
base::`anonymous namespace'::ThreadFunc