Move screen_orientation public headers to module directory.

public/platform/WebScreenOrientationType.h

Index: public/platform/WebScreenOrientationType.h
diff --git a/public/platform/WebScreenOrientationType.h b/public/platform/WebScreenOrientationType.h
index ea1b55d5d6e64e52223b9f7d9e7314b46641c491..38d9ba368d49eb0bcc58f93a6b6e2f5c73461c35 100644
--- a/public/platform/WebScreenOrientationType.h
+++ b/public/platform/WebScreenOrientationType.h
@@ -2,19 +2,4 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef WebScreenOrientationType_h
-#define WebScreenOrientationType_h
-
-namespace blink {
-
-enum WebScreenOrientationType {
-    WebScreenOrientationUndefined = 0,
-    WebScreenOrientationPortraitPrimary,
-    WebScreenOrientationPortraitSecondary,
-    WebScreenOrientationLandscapePrimary,
-    WebScreenOrientationLandscapeSecondary
-};
-
-} // namespace blink
-
-#endif // WebScreenOrientationType_h
+#include "public/platform/modules/screen_orientation/WebScreenOrientationType.h"