Revert 93094 - Initial sensor event provider for testing views screen rotation

content/browser/sensors/provider_impl.cc

-// Copyright (c) 2011 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 "base/logging.h"
-#include "base/memory/singleton.h"
-#include "content/browser/sensors/provider_impl.h"
-
-namespace sensors {
-
-ProviderImpl* ProviderImpl::GetInstance() {
-  return Singleton<ProviderImpl>::get();
-}
-
-ProviderImpl::ProviderImpl()
-    : listeners_(new ListenerList()) {
-}
-
-ProviderImpl::~ProviderImpl() {
-}
-
-void ProviderImpl::AddListener(Listener* listener) {
-  listeners_->AddObserver(listener);
-}
-
-void ProviderImpl::RemoveListener(Listener* listener) {
-  listeners_->RemoveObserver(listener);
-}
-
-void ProviderImpl::ScreenOrientationChanged(
-    const ScreenOrientation& change) {
-  listeners_->Notify(&Listener::OnScreenOrientationChanged, change);
-}
-
-}  // namespace sensors