Convert utility process ImageWriter IPC to mojo

chrome/utility/chrome_content_utility_client.h

 // Copyright (c) 2012 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_UTILITY_CHROME_CONTENT_UTILITY_CLIENT_H_
 #define CHROME_UTILITY_CHROME_CONTENT_UTILITY_CLIENT_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 45 matching lines @@
       const IPC::PlatformFileForTransit& temp_file);
 #if defined(OS_MACOSX)
   void OnAnalyzeDmgFileForDownloadProtection(
       const IPC::PlatformFileForTransit& dmg_file);
 #endif  // defined(OS_MACOSX)
 #endif  // defined(FULL_SAFE_BROWSING)
 
   typedef ScopedVector<UtilityMessageHandler> Handlers;
   Handlers handlers_;
 
-  // Flag to enable whitelisting.
-  bool filter_messages_;
-  // A list of message_ids to filter.
-  std::set<int> message_id_whitelist_;
+  bool utility_process_running_elevated_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeContentUtilityClient);
 };
 
 #endif  // CHROME_UTILITY_CHROME_CONTENT_UTILITY_CLIENT_H_