Cleanup Blink's Platform from Screen Orientation stuff.

public/platform/WebScreenOrientationListener.h

Index: public/platform/WebScreenOrientationListener.h
diff --git a/public/platform/WebScreenOrientationListener.h b/public/platform/WebScreenOrientationListener.h
deleted file mode 100644
index 0f9586b0980641b9d00f4d190122166938f4d3e7..0000000000000000000000000000000000000000
--- a/public/platform/WebScreenOrientationListener.h
+++ /dev/null
@@ -1,22 +0,0 @@
-// 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 WebScreenOrientationListener_h
-#define WebScreenOrientationListener_h
-
-#include "WebScreenOrientationType.h"
-
-namespace blink {
-
-class WebScreenOrientationListener {
-public:
-    virtual ~WebScreenOrientationListener() { }
-
-    // This method is called every time the screen orientation changes.
-    virtual void didChangeScreenOrientation(WebScreenOrientationType) = 0;
-};
-
-} // namespace blink
-
-#endif // WebScreenOrientationListener_h