Remove last usage functions from HostContentSettingsMap and clean up prefs

chromecast/browser/cast_permission_manager.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 "chromecast/browser/cast_permission_manager.h"
 
 #include "base/callback.h"
 #include "base/logging.h"
 #include "content/public/browser/permission_type.h"
 
@@ skipping 40 matching lines @@
 }
 
 blink::mojom::PermissionStatus CastPermissionManager::GetPermissionStatus(
     content::PermissionType permission,
     const GURL& requesting_origin,
     const GURL& embedding_origin) {
   LOG(INFO) << __FUNCTION__ << ": " << static_cast<int>(permission);
   return blink::mojom::PermissionStatus::GRANTED;
 }
 
-void CastPermissionManager::RegisterPermissionUsage(
-    content::PermissionType permission,
-    const GURL& requesting_origin,
-    const GURL& embedding_origin) {
-}
-
 int CastPermissionManager::SubscribePermissionStatusChange(
     content::PermissionType permission,
     const GURL& requesting_origin,
     const GURL& embedding_origin,
     const base::Callback<void(blink::mojom::PermissionStatus)>& callback) {
   return kNoPendingOperation;
 }
 
 void CastPermissionManager::UnsubscribePermissionStatusChange(
     int subscription_id) {
 }
 
 }  // namespace shell
 }  // namespace chromecast