refactor to Introduce AUDIO_CAPTURE and VIDEO_CAPTURE permissions.

chrome/browser/media/media_stream_camera_permission_context_factory.h

+// 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.
+
+#ifndef CHROME_BROWSER_MEDIA_MEDIA_STREAM_CAMERA_PERMISSION_CONTEXT_FACTORY_H_
+#define CHROME_BROWSER_MEDIA_MEDIA_STREAM_CAMERA_PERMISSION_CONTEXT_FACTORY_H_
+
+#include "base/memory/singleton.h"
+#include "components/content_settings/core/common/content_settings_types.h"
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+
+class MediaStreamDevicePermissionContext;
+

[xhwang, 2015/08/27 19:25:17]

nit: no need to have an empty line here

[guoweis_left_chromium, 2015/08/27 23:18:34]

Done.

+class Profile;
+
+class MediaStreamCameraPermissionContextFactory
+    : public BrowserContextKeyedServiceFactory {
+ public:
+  static MediaStreamDevicePermissionContext* GetForProfile(Profile* profile);
+  static MediaStreamCameraPermissionContextFactory* GetInstance();
+
+ private:
+  friend struct DefaultSingletonTraits<
+      MediaStreamCameraPermissionContextFactory>;
+
+  MediaStreamCameraPermissionContextFactory();
+  ~MediaStreamCameraPermissionContextFactory() override;
+
+  // BrowserContextKeyedBaseFactory methods:
+  KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* profile) const override;
+  content::BrowserContext* GetBrowserContextToUse(
+      content::BrowserContext* context) const override;
+
+  DISALLOW_COPY_AND_ASSIGN(MediaStreamCameraPermissionContextFactory);
+};
+
+#endif  // CHROME_BROWSER_MEDIA_MEDIA_STREAM_CAMERA_PERMISSION_CONTEXT_FACTORY_H_