Make screen.orientation implementation use WebScreenInfo::orientationType

Source/modules/screen_orientation/ScreenOrientationController.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 ScreenOrientationController_h
 #define ScreenOrientationController_h
 
 #include "core/dom/DocumentSupplementable.h"
 #include "public/platform/WebScreenOrientationType.h"
 
 namespace WebCore {
 
+class FrameView;
+
 class ScreenOrientationController FINAL : public NoBaseWillBeGarbageCollected<ScreenOrientationController>, public DocumentSupplement {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(ScreenOrientationController);
 public:
-#if !ENABLE(OILPAN)
     virtual ~ScreenOrientationController();
-#endif
 
-    void didChangeScreenOrientation(blink::WebScreenOrientationType);
-
-    blink::WebScreenOrientationType orientation() const { return m_orientation; }
+    blink::WebScreenOrientationType orientation() const;
 
     // DocumentSupplement API.
     static ScreenOrientationController& from(Document&);
     static const char* supplementName();
 
 private:
     explicit ScreenOrientationController(Document&);
-
-    void dispatchOrientationChangeEvent();
+    static blink::WebScreenOrientationType computeOrientation(FrameView*);
 
     Document& m_document;
-    blink::WebScreenOrientationType m_orientation;
 };
 
 } // namespace WebCore
 
 #endif // ScreenOrientationController_h