Remove old permission delegation prototype

chrome/browser/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 837 matching lines @@
     "password_manager/password_store_win.cc",
     "password_manager/password_store_win.h",
     "password_manager/simple_password_store_mac.cc",
     "password_manager/simple_password_store_mac.h",
     "performance_monitor/performance_monitor.cc",
     "performance_monitor/performance_monitor.h",
     "performance_monitor/process_metrics_history.cc",
     "performance_monitor/process_metrics_history.h",
     "permissions/chooser_context_base.cc",
     "permissions/chooser_context_base.h",
-    "permissions/delegation_tracker.cc",
-    "permissions/delegation_tracker.h",
     "permissions/permission_blacklist_client.cc",
     "permissions/permission_blacklist_client.h",
     "permissions/permission_context_base.cc",
     "permissions/permission_context_base.h",
     "permissions/permission_decision_auto_blocker.cc",
     "permissions/permission_decision_auto_blocker.h",
     "permissions/permission_manager.cc",
     "permissions/permission_manager.h",
     "permissions/permission_manager_factory.cc",
     "permissions/permission_manager_factory.h",
@@ skipping 3685 matching lines @@
       "media/pepper_cdm_test_constants.cc",
       "media/pepper_cdm_test_constants.h",
     ]
   }
 }
 
 service_manifest("preferences_manifest") {
   name = "preferences"
   source = "prefs/preferences_manifest.json"
 }