Revert of Generalize and refactor DeviceSensorEvent* architecture to support multi-event type targets.

Source/core/frame/DeviceSingleWindowEventController.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 DeviceSingleWindowEventController_h
-#define DeviceSingleWindowEventController_h
-
-#include "core/frame/DOMWindowLifecycleObserver.h"
-#include "core/frame/DeviceEventControllerBase.h"
-#include "platform/heap/Handle.h"
-
-namespace WebCore {
-
-class Document;
-class Event;
-
-class DeviceSingleWindowEventController : public DeviceEventControllerBase, public DOMWindowLifecycleObserver {
-public:
-    // Inherited from DeviceEventControllerBase.
-    virtual void didUpdateData() OVERRIDE;
-
-    // Inherited from DOMWindowLifecycleObserver.
-    virtual void didAddEventListener(DOMWindow*, const AtomicString&) OVERRIDE;
-    virtual void didRemoveEventListener(DOMWindow*, const AtomicString&) OVERRIDE;
-    virtual void didRemoveAllEventListeners(DOMWindow*) OVERRIDE;
-
-protected:
-    explicit DeviceSingleWindowEventController(Document&);
-    virtual ~DeviceSingleWindowEventController();
-
-    void dispatchDeviceEvent(const PassRefPtrWillBeRawPtr<Event>);
-
-    virtual PassRefPtrWillBeRawPtr<Event> lastEvent() const = 0;
-    virtual const AtomicString& eventTypeName() const = 0;
-    virtual bool isNullEvent(Event*) const = 0;
-
-private:
-    bool m_needsCheckingNullEvents;
-    Document& m_document;
-};
-
-} // namespace WebCore
-
-#endif // DeviceSingleWindowEventController_h