Convert MimeRegistry to use mojo.

content/browser/mime_registry_message_filter.h

-// Copyright (c) 2011 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 CONTENT_BROWSER_MIME_REGISTRY_MESSAGE_FILTER_H_
-#define CONTENT_BROWSER_MIME_REGISTRY_MESSAGE_FILTER_H_
-
-#include "base/files/file_path.h"
-#include "content/public/browser/browser_message_filter.h"
-
-namespace content {
-
-class MimeRegistryMessageFilter : public BrowserMessageFilter {
- public:
-  MimeRegistryMessageFilter();
-
-  void OverrideThreadForMessage(const IPC::Message& message,
-                                BrowserThread::ID* thread) override;
-  bool OnMessageReceived(const IPC::Message& message) override;
-
- private:
-  ~MimeRegistryMessageFilter() override;
-
-  void OnGetMimeTypeFromExtension(const base::FilePath::StringType& ext,
-                                  std::string* mime_type);
-  void OnGetMimeTypeFromFile(const base::FilePath& file_path,
-                             std::string* mime_type);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_MIME_REGISTRY_MESSAGE_FILTER_H_