Remove LocalFrameLifecycleObserver::willDetachFrameHost()

third_party/WebKit/Source/modules/vr/VRController.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 VRController_h
 #define VRController_h
 
-#include "core/frame/LocalFrameLifecycleObserver.h"
+#include "core/frame/LocalFrame.h"
 #include "device/vr/vr_service.mojom-blink.h"
 #include "modules/ModulesExport.h"
 #include "platform/Supplementable.h"
 #include "wtf/Deque.h"
 
 #include <memory>
 
 namespace blink {
 
 class ServiceRegistry;
 class VRGetDevicesCallback;
 
 class MODULES_EXPORT VRController final
     : public GarbageCollectedFinalized<VRController>
-    , public Supplement<LocalFrame>
-    , public LocalFrameLifecycleObserver {
+    , public Supplement<LocalFrame> {
     USING_GARBAGE_COLLECTED_MIXIN(VRController);
     WTF_MAKE_NONCOPYABLE(VRController);
 public:
     virtual ~VRController();
 
     void getDisplays(std::unique_ptr<VRGetDevicesCallback>);
 
     device::blink::VRPosePtr getPose(unsigned index);
 
     void resetPose(unsigned index);
 
     static void provideTo(LocalFrame&, ServiceRegistry*);
     static VRController* from(LocalFrame&);
     static const char* supplementName();
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     VRController(LocalFrame&, ServiceRegistry*);
 
-    // Inherited from LocalFrameLifecycleObserver.
-    void willDetachFrameHost() override;
-
     // Binding callbacks.
     void onGetDisplays(mojo::WTFArray<device::blink::VRDisplayPtr>);
 
     Deque<std::unique_ptr<VRGetDevicesCallback>> m_pendingGetDevicesCallbacks;
     device::blink::VRServicePtr m_service;
 };
 
 } // namespace blink
 
 #endif // VRController_h