Revert of Reland: Geolocation: move from content/browser to device/

content/browser/geolocation/wifi_data_provider.cc

Index: content/browser/geolocation/wifi_data_provider.cc
diff --git a/content/browser/geolocation/wifi_data_provider.cc b/content/browser/geolocation/wifi_data_provider.cc
new file mode 100644
index 0000000000000000000000000000000000000000..aa4fb7fb04696079bd042ba4437161fc8d0a3253
--- /dev/null
+++ b/content/browser/geolocation/wifi_data_provider.cc
@@ -0,0 +1,54 @@
+// 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 "content/browser/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 content {
+
+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 content