2 files changed, 7 insertions, 8 deletions
diff --git a/dom/base/CustomElementRegistry.cpp b/dom/base/CustomElementRegistry.cpp
index ab1e60366..55e2d3b30 100644
--- a/dom/base/CustomElementRegistry.cpp
+++ b/dom/base/CustomElementRegistry.cpp
@@ -1019,9 +1019,8 @@ CustomElementReactionsStack::Enqueue(Element* aElement,
   }
 
   CycleCollectedJSContext* context = CycleCollectedJSContext::Get();
-  RefPtr<ProcessBackupQueueRunnable> processBackupQueueRunnable =
-    new ProcessBackupQueueRunnable(this);
-  context->DispatchToMicroTask(processBackupQueueRunnable.forget());
+  RefPtr<BackupQueueMicroTask> bqmt = new BackupQueueMicroTask(this);
+  context->DispatchMicroTaskRunnable(bqmt.forget());
 }
 
 void
diff --git a/dom/base/CustomElementRegistry.h b/dom/base/CustomElementRegistry.h
index 51c97fd5e..8cea11d1f 100644
--- a/dom/base/CustomElementRegistry.h
+++ b/dom/base/CustomElementRegistry.h
@@ -311,21 +311,21 @@ private:
   void Enqueue(Element* aElement, CustomElementReaction* aReaction);
 
 private:
-  class ProcessBackupQueueRunnable : public mozilla::Runnable {
+  class BackupQueueMicroTask final : public mozilla::MicroTaskRunnable {
     public:
-      explicit ProcessBackupQueueRunnable(CustomElementReactionsStack* aReactionStack)
-        : mReactionStack(aReactionStack)
+      explicit BackupQueueMicroTask(CustomElementReactionsStack* aReactionStack)
+        : MicroTaskRunnable()
+        , mReactionStack(aReactionStack)
       {
         MOZ_ASSERT(!mReactionStack->mIsBackupQueueProcessing,
                    "mIsBackupQueueProcessing should be initially false");
         mReactionStack->mIsBackupQueueProcessing = true;
       }
 
-      NS_IMETHOD Run() override
+      virtual void Run(AutoSlowOperation& aAso) override
       {
         mReactionStack->InvokeBackupQueue();
         mReactionStack->mIsBackupQueueProcessing = false;
-        return NS_OK;
       }
 
     private: