Remove all old-style DeviceManagementService legacy.

chrome/browser/policy/device_management_service.cc

Index: chrome/browser/policy/device_management_service.cc
diff --git a/chrome/browser/policy/device_management_service.cc b/chrome/browser/policy/device_management_service.cc
index 94607eb83257be1aae472c2ebce36d6a9b365c45..055c8d66880285f7ea1c7f4cc1f98ccb08979752 100644
--- a/chrome/browser/policy/device_management_service.cc
+++ b/chrome/browser/policy/device_management_service.cc
@@ -14,8 +14,6 @@
 #include "base/sys_info.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/net/chrome_net_log.h"
-#include "chrome/browser/policy/device_management_backend.h"
-#include "chrome/browser/policy/device_management_backend_impl.h"
 #include "chrome/common/chrome_version_info.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/common/content_client.h"
@@ -461,10 +459,6 @@ DeviceManagementService::~DeviceManagementService() {
   DCHECK(queued_jobs_.empty());
 }
 
-DeviceManagementBackend* DeviceManagementService::CreateBackend() {
-  return new DeviceManagementBackendImpl(this);
-}
-
 DeviceManagementRequestJob* DeviceManagementService::CreateJob(
     DeviceManagementRequestJob::JobType type) {
   return new DeviceManagementRequestJobImpl(type, this);