Remove all old-style DeviceManagementService legacy.

chrome/browser/policy/device_management_service.h

Index: chrome/browser/policy/device_management_service.h
diff --git a/chrome/browser/policy/device_management_service.h b/chrome/browser/policy/device_management_service.h
index f824d86165f860f9437be57b818e292c106d6528..0b77b8a3df1c3e584bfebd053ea6b166bdf8cad4 100644
--- a/chrome/browser/policy/device_management_service.h
+++ b/chrome/browser/policy/device_management_service.h
@@ -26,7 +26,6 @@ class URLRequestContextGetter;
 
 namespace policy {
 
-class DeviceManagementBackend;
 class DeviceManagementRequestJobImpl;
 class DeviceManagementService;
 
@@ -92,12 +91,6 @@ class DeviceManagementService : public content::URLFetcherDelegate {
   explicit DeviceManagementService(const std::string& server_url);
   virtual ~DeviceManagementService();
 
-  // Constructs a device management backend for use by client code. Ownership of
-  // the returned backend object is transferred to the caller.
-  // Marked virtual for the benefit of tests.
-  // TODO(mnissler): This is deprecated, remove. Use CreateJob() instead.
-  virtual DeviceManagementBackend* CreateBackend();
-
   // Creates a new device management request job. Ownership is transferred to
   // the caller.
   virtual DeviceManagementRequestJob* CreateJob(