sensors: Remove prototype implementation

chrome/browser/ui/views/ash/screen_orientation_listener.h

Index: chrome/browser/ui/views/ash/screen_orientation_listener.h
diff --git a/chrome/browser/ui/views/ash/screen_orientation_listener.h b/chrome/browser/ui/views/ash/screen_orientation_listener.h
deleted file mode 100644
index 0d248ece463c521861d07edba312ea23a57d6286..0000000000000000000000000000000000000000
--- a/chrome/browser/ui/views/ash/screen_orientation_listener.h
+++ /dev/null
@@ -1,32 +0,0 @@
-// Copyright (c) 2012 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 CHROME_BROWSER_UI_VIEWS_ASH_SCREEN_ORIENTATION_LISTENER_H_
-#define CHROME_BROWSER_UI_VIEWS_ASH_SCREEN_ORIENTATION_LISTENER_H_
-#pragma once
-
-#include "base/compiler_specific.h"
-#include "base/memory/singleton.h"
-#include "content/public/browser/sensors_listener.h"
-
-// A singleton object to manage screen orientation.
-class ScreenOrientationListener : public content::SensorsListener {
- public:
-  // Returns the singleton object.
-  static ScreenOrientationListener* GetInstance();
-
- private:
-  friend struct DefaultSingletonTraits<ScreenOrientationListener>;
-
-  ScreenOrientationListener();
-  virtual ~ScreenOrientationListener();
-
-  // content::SensorsListener implementation:
-  virtual void OnScreenOrientationChanged(
-      content::ScreenOrientation change) OVERRIDE;
-
-  DISALLOW_COPY_AND_ASSIGN(ScreenOrientationListener);
-};
-
-#endif  // CHROME_BROWSER_UI_VIEWS_ASH_SCREEN_ORIENTATION_LISTENER_H_