Bug 1527850 - Null out CompartmentPrivate's scope pointer when moving XPCWrappedNativeScope to the dying scopes list. r=bzbarsky

Differential Revision: https://phabricator.services.mozilla.com/D19772

--HG--
extra : moz-landing-system : lando

js/xpconnect/src/XPCWrappedNativeScope.cpp

@@ -351,6 +351,7 @@ void XPCWrappedNativeScope::UpdateWeakPointersAfterGC() {
 
   // Update our pointer to the compartment in case we finalized all globals.
   if (!js::CompartmentHasLiveGlobal(mCompartment)) {
+    CompartmentPrivate::Get(mCompartment)->scope = nullptr;
     mCompartment = nullptr;
     GetWrappedNativeMap()->Clear();
     mWrappedNativeProtoMap->Clear();