Remove last usage functions from HostContentSettingsMap and clean up prefs

content/shell/browser/shell_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 "content/shell/browser/shell_permission_manager.h"
 
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "content/public/browser/permission_type.h"
 #include "content/public/common/content_switches.h"
@@ skipping 68 matching lines @@
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   if ((permission == PermissionType::AUDIO_CAPTURE ||
        permission == PermissionType::VIDEO_CAPTURE) &&
       command_line->HasSwitch(switches::kUseFakeDeviceForMediaStream) &&
       command_line->HasSwitch(switches::kUseFakeUIForMediaStream)) {
     return blink::mojom::PermissionStatus::GRANTED;
   }
   return blink::mojom::PermissionStatus::DENIED;
 }
 
-void ShellPermissionManager::RegisterPermissionUsage(
-    PermissionType permission,
-    const GURL& requesting_origin,
-    const GURL& embedding_origin) {
-}
-
 int ShellPermissionManager::SubscribePermissionStatusChange(
     PermissionType permission,
     const GURL& requesting_origin,
     const GURL& embedding_origin,
     const base::Callback<void(blink::mojom::PermissionStatus)>& callback) {
   return kNoPendingOperation;
 }
 
 void ShellPermissionManager::UnsubscribePermissionStatusChange(
     int subscription_id) {
 }
 
 }  // namespace content