Revert of Reland: Geolocation: move from content/browser to device/ (patchset #2 id:20001 of https:…

device/geolocation/wifi_data_provider.cc

-// Copyright 2013 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 "device/geolocation/wifi_data_provider.h"
-
-#include "base/bind.h"
-#include "base/callback.h"
-#include "base/location.h"
-#include "base/threading/thread_task_runner_handle.h"
-
-namespace device {
-
-WifiDataProvider::WifiDataProvider()
-    : client_task_runner_(base::ThreadTaskRunnerHandle::Get()) {
-  DCHECK(client_task_runner_);
-}
-
-WifiDataProvider::~WifiDataProvider() {
-}
-
-void WifiDataProvider::AddCallback(WifiDataUpdateCallback* callback) {
-  callbacks_.insert(callback);
-}
-
-bool WifiDataProvider::RemoveCallback(WifiDataUpdateCallback* callback) {
-  return callbacks_.erase(callback) == 1;
-}
-
-bool WifiDataProvider::has_callbacks() const {
-  return !callbacks_.empty();
-}
-
-void WifiDataProvider::RunCallbacks() {
-  client_task_runner_->PostTask(
-      FROM_HERE, base::Bind(&WifiDataProvider::DoRunCallbacks, this));
-}
-
-bool WifiDataProvider::CalledOnClientThread() const {
-  return client_task_runner()->BelongsToCurrentThread();
-}
-
-void WifiDataProvider::DoRunCallbacks() {
-  // It's possible that all the callbacks went away whilst this task was
-  // pending. This is fine; the loop will be a no-op.
-  CallbackSet::const_iterator iter = callbacks_.begin();
-  while (iter != callbacks_.end()) {
-    WifiDataUpdateCallback* callback = *iter;
-    ++iter;  // Advance iter before running, in case callback unregisters.
-    callback->Run();
-  }
-}
-
-}  // namespace device