Switch PermissionStatus events to an observer model.

third_party/WebKit/Source/modules/permissions/PermissionStatus.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PermissionStatus_h
 #define PermissionStatus_h
 
 #include "bindings/core/v8/ActiveScriptWrappable.h"
 #include "core/dom/SuspendableObject.h"
 #include "core/events/EventTarget.h"
+#include "mojo/public/cpp/bindings/binding.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/modules/permissions/permission.mojom-blink.h"
 #include "wtf/text/AtomicString.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class ExecutionContext;
 class ScriptPromiseResolver;
 
 // Expose the status of a given WebPermissionType for the current
 // ExecutionContext.
 class PermissionStatus final : public EventTargetWithInlineData,
                                public ActiveScriptWrappable,
-                               public SuspendableObject {
+                               public SuspendableObject,
+                               public mojom::blink::PermissionObserver {
   USING_GARBAGE_COLLECTED_MIXIN(PermissionStatus);
   DEFINE_WRAPPERTYPEINFO();
+  USING_PRE_FINALIZER(PermissionStatus, dispose);
 
   using MojoPermissionDescriptor = mojom::blink::PermissionDescriptorPtr;
   using MojoPermissionStatus = mojom::blink::PermissionStatus;
 
  public:
   static PermissionStatus* take(ScriptPromiseResolver*,
                                 MojoPermissionStatus,
                                 MojoPermissionDescriptor);
 
   static PermissionStatus* createAndListen(ExecutionContext*,
                                            MojoPermissionStatus,
                                            MojoPermissionDescriptor);
   ~PermissionStatus() override;
+  void dispose();
 
   // EventTarget implementation.
   const AtomicString& interfaceName() const override;
   ExecutionContext* getExecutionContext() const override;
 
   // ScriptWrappable implementation.
   bool hasPendingActivity() const final;
 
   // SuspendableObject implementation.
   void suspend() override;
   void resume() override;
   void contextDestroyed() override;
 
   String state() const;
-  void permissionChanged(MojoPermissionStatus);
 
   DEFINE_ATTRIBUTE_EVENT_LISTENER(change);
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   PermissionStatus(ExecutionContext*,
                    MojoPermissionStatus,
                    MojoPermissionDescriptor);
 
   void startListening();
   void stopListening();
 
+  void OnPermissionStatusChange(MojoPermissionStatus);
+
   MojoPermissionStatus m_status;
   MojoPermissionDescriptor m_descriptor;
-  mojom::blink::PermissionServicePtr m_service;
+  mojo::Binding<mojom::blink::PermissionObserver> m_binding;
 };
 
 }  // namespace blink
 
 #endif  // PermissionStatus_h