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diff --git a/dom/quota/QuotaManagerService.h b/dom/quota/QuotaManagerService.h
new file mode 100644
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+++ b/dom/quota/QuotaManagerService.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_quota_QuotaManagerService_h
+#define mozilla_dom_quota_QuotaManagerService_h
+
+#include <cstdint>
+#include "ErrorList.h"
+#include "mozilla/AlreadyAddRefed.h"
+#include "mozilla/HalBatteryInformation.h"
+#include "mozilla/dom/ipc/IdType.h"
+#include "nsIObserver.h"
+#include "nsIQuotaManagerService.h"
+#include "nsISupports.h"
+
+#define QUOTAMANAGER_SERVICE_CONTRACTID \
+  "@mozilla.org/dom/quota-manager-service;1"
+
+class nsIPrincipal;
+class nsIQuotaRequest;
+class nsIQuotaUsageCallback;
+class nsIQuotaUsageRequest;
+
+namespace mozilla {
+namespace ipc {
+
+class PBackgroundChild;
+
+}  // namespace ipc
+
+namespace hal {
+class BatteryInformation;
+}
+
+namespace dom::quota {
+
+class QuotaChild;
+class QuotaManager;
+
+class QuotaManagerService final : public nsIQuotaManagerService,
+                                  public nsIObserver,
+                                  public hal::BatteryObserver {
+  using PBackgroundChild = mozilla::ipc::PBackgroundChild;
+
+  class BackgroundCreateCallback;
+  class PendingRequestInfo;
+  class UsageRequestInfo;
+  class RequestInfo;
+  class IdleMaintenanceInfo;
+
+  QuotaChild* mBackgroundActor;
+
+  bool mBackgroundActorFailed;
+  bool mIdleObserverRegistered;
+
+ public:
+  // Returns a non-owning reference.
+  static QuotaManagerService* GetOrCreate();
+
+  // Returns a non-owning reference.
+  static QuotaManagerService* Get();
+
+  // No one should call this but the factory.
+  static already_AddRefed<QuotaManagerService> FactoryCreate();
+
+  void ClearBackgroundActor();
+
+  // Called when a process is being shot down. Aborts any running operations
+  // for the given process.
+  void AbortOperationsForProcess(ContentParentId aContentParentId);
+
+ private:
+  QuotaManagerService();
+  ~QuotaManagerService();
+
+  nsresult Init();
+
+  void Destroy();
+
+  nsresult EnsureBackgroundActor();
+
+  nsresult InitiateRequest(PendingRequestInfo& aInfo);
+
+  void PerformIdleMaintenance();
+
+  void RemoveIdleObserver();
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIQUOTAMANAGERSERVICE
+  NS_DECL_NSIOBSERVER
+
+  // BatteryObserver override
+  void Notify(const hal::BatteryInformation& aBatteryInfo) override;
+};
+
+}  // namespace dom::quota
+}  // namespace mozilla
+
+#endif /* mozilla_dom_quota_QuotaManagerService_h */