Bug 1353762 - Check for OOM when creating WebCryptoTasks r=keeler,mt

dom/base/SubtleCrypto.cpp

@@ -57,6 +57,10 @@ SubtleCrypto::RecordTelemetryOnce() {
   RecordTelemetryOnce();                                                \
   RefPtr<WebCryptoTask> task =                                          \
     WebCryptoTask::Create ## Operation ## Task(__VA_ARGS__);            \
+  if (!task) {                                                          \
+    aRv.Throw(NS_ERROR_OUT_OF_MEMORY);                                  \
+    return nullptr;                                                     \
+  }                                                                     \
   task->DispatchWithPromise(p);                                         \
   return p.forget();
 

dom/media/webrtc/RTCCertificate.cpp

@@ -280,6 +280,10 @@ RTCCertificate::GenerateCertificate(
   RefPtr<WebCryptoTask> task =
       new GenerateRTCCertificateTask(global, aGlobal.Context(),
                                      aOptions, usages, expires);
+  if (!task) {
+    aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
+    return nullptr;
+  }
   task->DispatchWithPromise(p);
   return p.forget();
 }