[screen-orientation] Update implementation to match recent spec changes.

Source/modules/screen_orientation/ScreenScreenOrientation.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 ScreenScreenOrientation_h
+#define ScreenScreenOrientation_h
+
+#include "platform/Supplementable.h"
+
+namespace WebCore {
+
+class ScreenOrientation;
+class Screen;
+class ScriptState;
+
+class ScreenScreenOrientation FINAL :
+    public NoBaseWillBeGarbageCollectedFinalized<ScreenScreenOrientation>,
+    public WillBeHeapSupplement<Screen> {
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(ScreenScreenOrientation);
+public:
+    static ScreenScreenOrientation& from(Screen&);
+    virtual ~ScreenScreenOrientation();
+
+    static ScreenOrientation* orientation(ScriptState*, Screen&);
+
+    virtual void trace(Visitor*) OVERRIDE;
+
+private:
+    static const char* supplementName();
+
+    PersistentWillBeMember<ScreenOrientation> m_orientation;
+};
+
+} // namespace WebCore
+
+#endif // ScreenScreenOrientation_h