[Sync] Componentize local_device_info_provider_impl and test

chrome/browser/sync/profile_sync_service.cc

Index: chrome/browser/sync/profile_sync_service.cc
diff --git a/chrome/browser/sync/profile_sync_service.cc b/chrome/browser/sync/profile_sync_service.cc
index 49682ccb1413ad3875ed477a11217b9bbbcb5014..8637210d6a9986c6b79f319e4f57188360202915 100644
--- a/chrome/browser/sync/profile_sync_service.cc
+++ b/chrome/browser/sync/profile_sync_service.cc
@@ -1127,7 +1127,8 @@ void ProfileSyncService::OnBackendInitialized(
       signin_client->GetSigninScopedDeviceId();
 
   // Initialize local device info.
-  local_device_->Initialize(cache_guid, signin_scoped_device_id);
+  local_device_->Initialize(cache_guid, signin_scoped_device_id,
+                            content::BrowserThread::GetBlockingPool());
 
   if (backend_mode_ == BACKUP || backend_mode_ == ROLLBACK)
     ConfigureDataTypeManager();