Make screen.orientation implementation use WebScreenInfo::orientationType

Source/modules/screen_orientation/ScreenOrientationController.h

Index: Source/modules/screen_orientation/ScreenOrientationController.h
diff --git a/Source/modules/screen_orientation/ScreenOrientationController.h b/Source/modules/screen_orientation/ScreenOrientationController.h
index 81d24fdc4747aa3df50a9cd735363c9d6de367b1..5bc56f45f991c8450fbd150323310d990e5c08ec 100644
--- a/Source/modules/screen_orientation/ScreenOrientationController.h
+++ b/Source/modules/screen_orientation/ScreenOrientationController.h
@@ -10,16 +10,14 @@
 
 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&);
@@ -27,11 +25,9 @@ public:
 
 private:
     explicit ScreenOrientationController(Document&);
-
-    void dispatchOrientationChangeEvent();
+    static blink::WebScreenOrientationType computeOrientation(FrameView*);
 
     Document& m_document;
-    blink::WebScreenOrientationType m_orientation;
 };
 
 } // namespace WebCore