refactor to Introduce AUDIO_CAPTURE and VIDEO_CAPTURE permissions.

chrome/browser/media/media_stream_mic_permission_context_factory.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 "chrome/browser/media/media_stream_mic_permission_context_factory.h"
+
+#include "chrome/browser/media/media_stream_device_permission_context.h"
+#include "chrome/browser/profiles/incognito_helpers.h"
+#include "chrome/browser/profiles/profile.h"
+#include "components/keyed_service/content/browser_context_dependency_manager.h"
+
+MediaStreamMicPermissionContextFactory::MediaStreamMicPermissionContextFactory()
+    : BrowserContextKeyedServiceFactory(
+          "MediaStreamMicPermissionContext",
+          BrowserContextDependencyManager::GetInstance()) {}
+
+MediaStreamMicPermissionContextFactory::
+    ~MediaStreamMicPermissionContextFactory() {}
+
+KeyedService* MediaStreamMicPermissionContextFactory::BuildServiceInstanceFor(
+    content::BrowserContext* profile) const {
+  return new MediaStreamDevicePermissionContext(
+      static_cast<Profile*>(profile), CONTENT_SETTINGS_TYPE_MEDIASTREAM_MIC);
+}
+
+content::BrowserContext*
+MediaStreamMicPermissionContextFactory::GetBrowserContextToUse(
+    content::BrowserContext* context) const {
+  return chrome::GetBrowserContextOwnInstanceInIncognito(context);
+}
+
+// static
+MediaStreamMicPermissionContextFactory*
+MediaStreamMicPermissionContextFactory::GetInstance() {
+  return Singleton<MediaStreamMicPermissionContextFactory>::get();
+}
+
+// static
+MediaStreamDevicePermissionContext*
+MediaStreamMicPermissionContextFactory::GetForProfile(Profile* profile) {
+  return static_cast<MediaStreamDevicePermissionContext*>(
+      GetInstance()->GetServiceForBrowserContext(profile, true));
+}