Use TaskScheduler instead of blocking pool in version_handler_chromeos.cc.

chromeos/system/version_loader.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 CHROMEOS_SYSTEM_VERSION_LOADER_H_
 #define CHROMEOS_SYSTEM_VERSION_LOADER_H_
 
 #include <string>
 
 #include "chromeos/chromeos_export.h"
 
 namespace chromeos {
 namespace version_loader {
 
 enum VersionFormat {
   VERSION_SHORT,
   VERSION_SHORT_WITH_DATE,
   VERSION_FULL,
 };
 
 // Gets the version.
 // If |full_version| is true version string with extra info is extracted,
 // otherwise it's in short format x.x.xx.x.
-// Must be run on a blocking thread pool.
+// May block.
 CHROMEOS_EXPORT std::string GetVersion(VersionFormat format);
 
 // Gets the ARC version.
-// Must be run on a blocking thread pool.
+// May block.
 CHROMEOS_EXPORT std::string GetARCVersion();
 
 // Gets the firmware info.
-// Must be run on a blocking thread pool.
+// May block.
 CHROMEOS_EXPORT std::string GetFirmware();
 
 // Extracts the firmware from the file.
 CHROMEOS_EXPORT std::string ParseFirmware(const std::string& contents);
 
 }  // namespace version_loader
 }  // namespace chromeos
 
 #endif  // CHROMEOS_SYSTEM_VERSION_LOADER_H_