Revert of chromeos: Convert ash VPNDelegate interface to mojo

ash/common/system/chromeos/network/vpn_delegate.cc

+// Copyright 2015 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 "ash/common/system/chromeos/network/vpn_delegate.h"
+
+#include "base/logging.h"
+
+namespace ash {
+
+VPNProvider::VPNProvider() : third_party(false) {}
+
+VPNProvider::VPNProvider(const std::string& extension_id,
+                         const std::string& third_party_provider_name)
+    : third_party(true),
+      extension_id(extension_id),
+      third_party_provider_name(third_party_provider_name) {
+  DCHECK(!extension_id.empty());
+  DCHECK(!third_party_provider_name.empty());
+}
+
+bool VPNProvider::operator==(const VPNProvider& other) const {
+  return third_party == other.third_party &&
+         extension_id == other.extension_id &&
+         third_party_provider_name == other.third_party_provider_name;
+}
+
+VPNDelegate::Observer::~Observer() {}
+
+VPNDelegate::VPNDelegate() {
+  AddBuiltInProvider();
+}
+
+VPNDelegate::~VPNDelegate() {}
+
+bool VPNDelegate::HaveThirdPartyVPNProviders() const {
+  for (const VPNProvider& provider : vpn_providers_) {
+    if (provider.third_party)
+      return true;
+  }
+  return false;
+}
+
+void VPNDelegate::AddObserver(Observer* observer) {
+  observer_list_.AddObserver(observer);
+}
+
+void VPNDelegate::RemoveObserver(Observer* observer) {
+  observer_list_.RemoveObserver(observer);
+}
+
+void VPNDelegate::SetThirdPartyVpnProviders(
+    const std::vector<VPNProvider>& third_party_providers) {
+  vpn_providers_.clear();
+  vpn_providers_.reserve(third_party_providers.size() + 1);
+  AddBuiltInProvider();
+  // Append the extension-backed providers.
+  vpn_providers_.insert(vpn_providers_.end(), third_party_providers.begin(),
+                        third_party_providers.end());
+  NotifyObservers();
+}
+
+void VPNDelegate::NotifyObservers() {
+  for (auto& observer : observer_list_)
+    observer.OnVPNProvidersChanged();
+}
+
+void VPNDelegate::AddBuiltInProvider() {
+  // The VPNProvider() constructor generates the built-in provider and has no
+  // extension ID.
+  vpn_providers_.push_back(VPNProvider());
+}
+
+}  // namespace ash