sensors: Remove prototype implementation

content/public/browser/sensors_provider.h

-// 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 CONTENT_PUBLIC_BROWSER_SENSORS_PROVIDER_H_
-#define CONTENT_PUBLIC_BROWSER_SENSORS_PROVIDER_H_
-#pragma once
-
-#include "content/common/content_export.h"
-#include "content/public/browser/sensors.h"
-
-// The sensors API will unify various types of sensor data into a set of
-// channels, each of which provides change events and periodic updates.
-//
-// This version of the API is intended only to support the experimental screen
-// rotation code and is not for general use. In particular, the final listener
-// will declare generic |OnSensorChanged| and |OnSensorUpdated| methods, rather
-// than the special-purpose |OnScreenOrientationChanged|.
-
-namespace content {
-
-class SensorsListener;
-
-// TODO(cwolfe): Finish defining the initial set of channels and replace this
-// with the generic sensor provider.
-class SensorsProvider {
- public:
-  CONTENT_EXPORT static SensorsProvider* GetInstance();
-
-  // Adds a sensor listener. The listener will receive callbacks to indicate
-  // sensor changes and updates until it is removed.
-  //
-  // This method may be called in any thread. Callbacks on a listener will
-  // always be executed in the thread which added that listener.
-  virtual void AddListener(SensorsListener* listener) = 0;
-
-  // Removes a sensor listener.
-  //
-  // This method must be called in the same thread which added the listener.
-  // If the listener is not currently subscribed, this method may be called in
-  // any thread.
-  virtual void RemoveListener(SensorsListener* listener) = 0;
-
-  // Broadcasts a change to the coarse screen orientation.
-  //
-  // This method may be called in any thread.
-  virtual void ScreenOrientationChanged(ScreenOrientation change) = 0;
-
- protected:
-  virtual ~SensorsProvider() {}
-};
-
-}  // namespace content
-
-#endif  // CONTENT_PUBLIC_BROWSER_SENSORS_PROVIDER_H_