Merge {Device,User}ActiveDirectoryPolicyManager into a single class

chrome/browser/chromeos/BUILD.gn

Index: chrome/browser/chromeos/BUILD.gn
diff --git a/chrome/browser/chromeos/BUILD.gn b/chrome/browser/chromeos/BUILD.gn
index 4a6c5b79e63a21e09de6537a36769f181a7ac1da..3cfdceb968220aafc963fa876b12a0ce900b4b70 100644
--- a/chrome/browser/chromeos/BUILD.gn
+++ b/chrome/browser/chromeos/BUILD.gn
@@ -1024,6 +1024,8 @@ source_set("chromeos") {
     "platform_keys/platform_keys_service.h",
     "platform_keys/platform_keys_service_factory.cc",
     "platform_keys/platform_keys_service_factory.h",
+    "policy/active_directory_policy_manager.cc",
+    "policy/active_directory_policy_manager.h",
     "policy/affiliated_cloud_policy_invalidator.cc",
     "policy/affiliated_cloud_policy_invalidator.h",
     "policy/affiliated_invalidation_service_provider.cc",
@@ -1046,8 +1048,6 @@ source_set("chromeos") {
     "policy/cloud_external_data_store.h",
     "policy/configuration_policy_handler_chromeos.cc",
     "policy/configuration_policy_handler_chromeos.h",
-    "policy/device_active_directory_policy_manager.cc",
-    "policy/device_active_directory_policy_manager.h",
     "policy/device_cloud_policy_initializer.cc",
     "policy/device_cloud_policy_initializer.h",
     "policy/device_cloud_policy_manager_chromeos.cc",
@@ -1126,8 +1126,6 @@ source_set("chromeos") {
     "policy/upload_job.h",
     "policy/upload_job_impl.cc",
     "policy/upload_job_impl.h",
-    "policy/user_active_directory_policy_manager.cc",
-    "policy/user_active_directory_policy_manager.h",
     "policy/user_cloud_external_data_manager.cc",
     "policy/user_cloud_external_data_manager.h",
     "policy/user_cloud_policy_manager_chromeos.cc",