sensors: Remove prototype implementation

content/browser/sensors/sensors_provider_impl.cc

-// 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.
-
-#include "content/browser/sensors/sensors_provider_impl.h"
-
-#include "base/memory/singleton.h"
-#include "content/public/browser/sensors_listener.h"
-
-namespace content {
-
-// static
-SensorsProvider* SensorsProvider::GetInstance() {
-  return SensorsProviderImpl::GetInstance();
-}
-
-// static
-SensorsProviderImpl* SensorsProviderImpl::GetInstance() {
-  return Singleton<SensorsProviderImpl>::get();
-}
-
-void SensorsProviderImpl::AddListener(SensorsListener* listener) {
-  listeners_->AddObserver(listener);
-}
-
-void SensorsProviderImpl::RemoveListener(SensorsListener* listener) {
-  listeners_->RemoveObserver(listener);
-}
-
-void SensorsProviderImpl::ScreenOrientationChanged(ScreenOrientation change) {
-  listeners_->Notify(&SensorsListener::OnScreenOrientationChanged, change);
-}
-
-SensorsProviderImpl::SensorsProviderImpl()
-    : listeners_(new ListenerList()) {
-}
-
-SensorsProviderImpl::~SensorsProviderImpl() {
-}
-
-}  // namespace content