Refactor OAuth2TokenService to have profile- and device-based implementations.

chrome/browser/chromeos/settings/device_oauth2_token_service_factory.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 "chrome/browser/chromeos/settings/device_oauth2_token_service_factory.h"
+
+#include "base/lazy_instance.h"
+#include "chrome/browser/browser_process.h"
+#include "content/public/browser/browser_thread.h"
+
+namespace chromeos {
+
+static base::LazyInstance<DeviceOAuth2TokenServiceFactory>
+    g_device_oauth2_token_service_factory_ = LAZY_INSTANCE_INITIALIZER;
+
+DeviceOAuth2TokenServiceFactory::DeviceOAuth2TokenServiceFactory() {
+}
+
+DeviceOAuth2TokenServiceFactory::~DeviceOAuth2TokenServiceFactory() {
+  // The DeviceOAuth2TokenService destructor will cancel all pending fetchers.
+}
+
+// static
+DeviceOAuth2TokenService* DeviceOAuth2TokenServiceFactory::Get() {
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DeviceOAuth2TokenServiceFactory factory =
+      g_device_oauth2_token_service_factory_.Get();
+
+  return factory.GetImpl();
+}
+
+DeviceOAuth2TokenService* DeviceOAuth2TokenServiceFactory::GetImpl() {
+  if (!device_oauth2_token_service_) {
+    device_oauth2_token_service_.reset(
+        new DeviceOAuth2TokenService(
+            g_browser_process->system_request_context()));
+  }
+  return device_oauth2_token_service_.get();
+}
+
+}  // namespace chromeos