Bug 1351488 - Avoid temporary RefPtr to silence rooting hazard (r=sfink)

MozReview-Commit-ID: IAvNr1PmEfp

--HG--
extra : rebase_source : 7efb22db6f2fb8da592af2db61ea5c882a12dd53

dom/base/StructuredCloneHolder.cpp

@@ -887,8 +887,7 @@ ReadWasmModule(JSContext* aCx,
   MOZ_ASSERT(aHolder->CloneScope() == StructuredCloneHolder::StructuredCloneScope::SameProcessSameThread ||
              aHolder->CloneScope() == StructuredCloneHolder::StructuredCloneScope::SameProcessDifferentThread);
 
-  RefPtr<JS::WasmModule> wasmModule = aHolder->WasmModules()[aIndex];
-  return wasmModule->createObject(aCx);
+  return aHolder->WasmModules()[aIndex]->createObject(aCx);
 }
 
 bool