Merge //content/child/permissions into Blink's permissions module.

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

-// Copyright 2015 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 PermissionController_h
-#define PermissionController_h
-
-#include "core/frame/LocalFrameLifecycleObserver.h"
-#include "modules/ModulesExport.h"
-#include "platform/Supplementable.h"
-
-namespace blink {
-
-class WebPermissionClient;
-
-class MODULES_EXPORT PermissionController final
-    : public GarbageCollectedFinalized<PermissionController>
-    , public Supplement<LocalFrame>
-    , public LocalFrameLifecycleObserver {
-    WTF_MAKE_NONCOPYABLE(PermissionController);
-    USING_GARBAGE_COLLECTED_MIXIN(PermissionController);
-public:
-    virtual ~PermissionController();
-
-    static void provideTo(LocalFrame&, WebPermissionClient*);
-    static PermissionController* from(LocalFrame&);
-    static const char* supplementName();
-
-    WebPermissionClient* client() const;
-
-    DECLARE_VIRTUAL_TRACE();
-
-private:
-    PermissionController(LocalFrame&, WebPermissionClient*);
-
-    // Inherited from LocalFrameLifecycleObserver.
-    void willDetachFrameHost() override;
-
-    WebPermissionClient* m_client;
-};
-
-} // namespace blink
-
-#endif // PermissionController_h