Implement PermissionDescriptor usage in Permissions API.

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 "core/dom/ContextLifecycleObserver.h"
 #include "core/events/EventTarget.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/modules/permissions/WebPermissionStatus.h"
 #include "public/platform/modules/permissions/WebPermissionType.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 RefCountedGarbageCollectedEventTargetWithInlineData<PermissionStatus>
     , public ContextLifecycleObserver {
     DEFINE_EVENT_TARGET_REFCOUNTING_WILL_BE_REMOVED(RefCountedGarbageCollected<PermissionStatus>);
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(PermissionStatus);
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PermissionStatus* take(ScriptPromiseResolver*, WebPermissionStatus*, WebPermissionType);
     static void dispose(WebPermissionStatus*);
 
+    PermissionStatus(ExecutionContext*, WebPermissionStatus);
     ~PermissionStatus() override;
 
     // EventTarget implementation.
     const AtomicString& interfaceName() const override;
     ExecutionContext* executionContext() const override;
 
     DECLARE_VIRTUAL_TRACE();
 
     String status() const;
-    // TODO: needs to be used by the IDL
-    WebPermissionType type() const { return m_type; }
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(change);
 
 private:
-    explicit PermissionStatus(ExecutionContext*, WebPermissionType, WebPermissionStatus);
-
-    WebPermissionType m_type;
     WebPermissionStatus m_status;
 };
 
 } // namespace blink
 
 #endif // PermissionStatus_h