Move screen_orientation public headers to module directory.

public/platform/WebScreenOrientationClient.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 WebScreenOrientationClient_h
-#define WebScreenOrientationClient_h
-
-#include "public/platform/WebScreenOrientationLockType.h"
-
-namespace blink {
-
-class WebLockOrientationCallback;
-
-// Client handling screen orientation locking for a given WebFrame.
-class WebScreenOrientationClient {
-public:
-    virtual ~WebScreenOrientationClient() { }
-
-    // Request a screen orientation lock. The implementation will own the callback.
-    virtual void lockOrientation(WebScreenOrientationLockType, WebLockOrientationCallback*) = 0;
-
-    // Unlock the screen orientation. No-op if the screen orientation was not locked.
-    virtual void unlockOrientation() = 0;
-};
-
-} // namespace blink
-
-#endif // WebScreenOrientationClient_h
+#include "public/platform/modules/screen_orientation/WebScreenOrientationClient.h"