Issue #1587 - Part 7: Rename FetchController to AbortController

Also renames FetchSignal to AbortSignal. Includes renaming the various
controlling prefs to enable.

dom/abort/AbortController.h

@@ -0,0 +1,73 @@
+/* -*- 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_AbortController_h
+#define mozilla_dom_AbortController_h
+
+#include "mozilla/dom/BindingDeclarations.h"
+#include "mozilla/dom/AbortSignal.h" 
+#include "nsCycleCollectionParticipant.h"
+#include "nsWrapperCache.h"
+#include "mozilla/ErrorResult.h"
+#include "nsIGlobalObject.h"
+
+namespace mozilla {
+namespace dom {
+
+class AbortController final : public nsISupports
+                            , public nsWrapperCache
+                            , public AbortSignal::Follower
+{
+public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(AbortController)
+
+  static bool
+  IsEnabled(JSContext* aCx, JSObject* aGlobal);
+
+  static already_AddRefed<AbortController>
+  Constructor(const GlobalObject& aGlobal, ErrorResult& aRv);
+
+  explicit AbortController(nsIGlobalObject* aGlobal);
+
+  JSObject*
+  WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
+
+  nsIGlobalObject*
+  GetParentObject() const;
+
+  AbortSignal*
+  Signal();
+
+  void
+  Abort();
+
+  void
+  Follow(AbortSignal& aSignal);
+
+  void
+  Unfollow(AbortSignal& aSignal);
+
+  AbortSignal*
+  Following() const;
+
+  // AbortSignal::Follower
+
+  void Aborted() override;
+
+private:
+  ~AbortController() = default;
+
+  nsCOMPtr<nsIGlobalObject> mGlobal;
+  RefPtr<AbortSignal> mSignal;
+
+  bool mAborted;
+};
+
+} // dom namespace
+} // mozilla namespace
+
+#endif // mozilla_dom_AbortController_h