Bug 242262

Crash under ~TimerBase() from LibWebRTCAudioModule: Thread 17 Crashed:: Dispatch queue: WebKitWebRTCAudioModule 0 WebCore 0x18fd8cc44 WTFCrashWithInfo(int, char const*, char const*, int) + 20 (wtf/Assertions.h:697) 1 WebCore 0x1918dbcb4 WebCore::TimerBase::~TimerBase() + 272 (Source/WebCore/./platform/Timer.cpp:262) 2 WebCore 0x191a983ec rtc::RefCountedObject<WebCore::LibWebRTCAudioModule>::~RefCountedObject() + 136 (Source/WebCore/platform/Timer.h:108) 3 WebCore 0x191a98260 rtc::RefCountedObject<WebCore::LibWebRTCAudioModule>::Release() const + 76 (webrtc/rtc_base/ref_counted_object.h:42) 4 WebCore 0x18feb630c WTF::Detail::CallableWrapper<WebCore::LibWebRTCAudioModule::pollAudioData()::$_4, void>::~CallableWrapper() + 92 (webrtc/api/scoped_refptr.h:102) 5 JavaScriptCore 0x18ce0c450 void WTF::dispatchWorkItem<WTF::(anonymous namespace)::DispatchWorkItem>(void*) + 108 (/usr/include/c++/v1/memory:1428) 6 libdispatch.dylib 0x18061f518 _dispatch_client_callout + 20 7 libdispatch.dylib 0x180622a48 _dispatch_continuation_pop + 504 8 libdispatch.dylib 0x180635c7c _dispatch_source_invoke + 1364 9 libdispatch.dylib 0x180626c80 _dispatch_lane_serial_drain + 372 10 libdispatch.dylib 0x180627920 _dispatch_lane_invoke + 408 11 libdispatch.dylib 0x1806321b4 _dispatch_workloop_worker_thread + 660 12 libsystem_pthread.dylib 0x1f0b40064 _pthread_wqthread + 288 13 libsystem_pthread.dylib 0x1f0b3fdfc start_wqthread + 8