Start pulling away notification logic from ChromeContentBrowserClient.

chrome/browser/notifications/platform_notification_service_impl.h

+// Copyright 2014 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.
+
+#ifndef CHROME_BROWSER_NOTIFICATIONS_PLATFORM_NOTIFICATION_SERVICE_IMPL_H_
+#define CHROME_BROWSER_NOTIFICATIONS_PLATFORM_NOTIFICATION_SERVICE_IMPL_H_
+
+#include "base/memory/singleton.h"
+#include "content/public/browser/platform_notification_service.h"
+
+// The platform notification service is the profile-agnostic entry point through
+// which Web Notifications can be controlled.
+class PlatformNotificationServiceImpl
+    : public content::PlatformNotificationService {
+ public:
+  // Returns the active instance of the service in the browser process. Safe to
+  // be called from any thread.
+  static PlatformNotificationServiceImpl* GetInstance();
+
+  // content::PlatformNotificationService implementation.
+  blink::WebNotificationPermission CheckPermission(
+      content::ResourceContext* resource_context,
+      const GURL& origin,
+      int render_process_id) override;;
+  void DisplayNotification(
+      content::BrowserContext* browser_context,
+      const content::ShowDesktopNotificationHostMsgParams& params,
+      scoped_ptr<content::DesktopNotificationDelegate> delegate,
+      int render_process_id,
+      base::Closure* cancel_callback) override;
+
+ private:
+  friend struct DefaultSingletonTraits<PlatformNotificationServiceImpl>;
+
+  PlatformNotificationServiceImpl();
+  ~PlatformNotificationServiceImpl() override;
+};
+
+#endif  // CHROME_BROWSER_NOTIFICATIONS_PLATFORM_NOTIFICATION_SERVICE_IMPL_H_