Convert utility process ParseMediaMetadata blob reading 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 19 matching lines @@
  public:
   ChromeContentUtilityClient();
   ~ChromeContentUtilityClient() override;
 
   void UtilityThreadStarted() override;
   bool OnMessageReceived(const IPC::Message& message) override;
   void ExposeInterfacesToBrowser(
       service_manager::InterfaceRegistry* registry) override;
   void RegisterServices(StaticServiceMap* services) override;
 
-  void AddHandler(std::unique_ptr<UtilityMessageHandler> handler);
-
   static void PreSandboxStartup();
 
  private:
   // IPC message handlers.
 #if defined(OS_CHROMEOS)
   void OnCreateZipFile(const base::FilePath& src_dir,
                        const std::vector<base::FilePath>& src_relative_paths,
                        const base::FileDescriptor& dest_fd);
 #endif  // defined(OS_CHROMEOS)
 
@@ skipping 13 matching lines @@
 
   // Flag to enable whitelisting.
   bool filter_messages_;
   // A list of message_ids to filter.
   std::set<int> message_id_whitelist_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeContentUtilityClient);
 };
 
 #endif  // CHROME_UTILITY_CHROME_CONTENT_UTILITY_CLIENT_H_