[Extensions] Convert some ChromeSyncExtensionFunctions

chrome/browser/extensions/api/signed_in_devices/signed_in_devices_api.h

 // Copyright (c) 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_SIGNED_IN_DEVICES_SIGNED_IN_DEVICES_API_H__
 #define CHROME_BROWSER_EXTENSIONS_API_SIGNED_IN_DEVICES_SIGNED_IN_DEVICES_API_H__
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 19 matching lines @@
 // public device ids are set per extension.
 std::vector<std::unique_ptr<syncer::DeviceInfo>> GetAllSignedInDevices(
     const std::string& extension_id,
     Profile* profile);
 
 std::vector<std::unique_ptr<syncer::DeviceInfo>> GetAllSignedInDevices(
     const std::string& extension_id,
     syncer::DeviceInfoTracker* device_tracker,
     ExtensionPrefs* extension_prefs);
 
-class SignedInDevicesGetFunction : public ChromeSyncExtensionFunction {
+class SignedInDevicesGetFunction : public UIThreadExtensionFunction {
  protected:
   ~SignedInDevicesGetFunction() override {}
 
   // ExtensionFunction:
-  bool RunSync() override;
+  ResponseAction Run() override;
   DECLARE_EXTENSION_FUNCTION("signedInDevices.get", SIGNED_IN_DEVICES_GET)
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_SIGNED_IN_DEVICES_SIGNED_IN_DEVICES_API_H__