Migrate a BrowserThread::PostTask to TaskScheduler

chrome/browser/chromeos/input_method/component_extension_ime_manager_impl.cc

 // Copyright 2013 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 "chrome/browser/chromeos/input_method/component_extension_ime_manager_impl.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 
 #include "base/files/file_util.h"
 #include "base/json/json_string_value_serializer.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/path_service.h"
 #include "base/strings/string_util.h"
 #include "base/sys_info.h"
+#include "base/task_scheduler/post_task.h"
 #include "chrome/browser/extensions/component_loader.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/grit/browser_resources.h"
-#include "content/public/browser/browser_thread.h"
 #include "extensions/browser/extension_pref_value_map.h"
 #include "extensions/browser/extension_pref_value_map_factory.h"
 #include "extensions/browser/extension_system.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/manifest_constants.h"
 #include "ui/base/ime/chromeos/extension_ime_util.h"
 #include "ui/base/resource/resource_bundle.h"
 
 namespace chromeos {
 
@@ skipping 105 matching lines @@
 }
 
 void ComponentExtensionIMEManagerImpl::Load(Profile* profile,
                                             const std::string& extension_id,
                                             const std::string& manifest,
                                             const base::FilePath& file_path) {
   // Check the existence of file path to avoid unnecessary extension loading
   // and InputMethodEngine creation, so that the virtual keyboard web content
   // url won't be override by IME component extensions.
   base::FilePath* copied_file_path = new base::FilePath(file_path);
-  content::BrowserThread::PostTaskAndReplyWithResult(
-      content::BrowserThread::FILE,
-      FROM_HERE,
-      base::Bind(&CheckFilePath,
-                 base::Unretained(copied_file_path)),
-      base::Bind(&OnFilePathChecked,
-                 base::Unretained(profile),
+  base::PostTaskWithTraitsAndReplyWithResult(
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
+      base::Bind(&CheckFilePath, base::Unretained(copied_file_path)),
+      base::Bind(&OnFilePathChecked, base::Unretained(profile),
                  base::Owned(new std::string(extension_id)),
                  base::Owned(new std::string(manifest)),
                  base::Owned(copied_file_path)));
 }
 
 void ComponentExtensionIMEManagerImpl::Unload(Profile* profile,
                                               const std::string& extension_id,
                                               const base::FilePath& file_path) {
   // Remove(extension_id) does nothing when the extension has already been
   // removed or not been registered.
@@ skipping 169 matching lines @@
 
       ComponentExtensionEngine engine;
       ReadEngineComponent(component_ime, *dictionary, &engine);
       component_ime.engines.push_back(engine);
     }
     out_imes->push_back(component_ime);
   }
 }
 
 }  // namespace chromeos