[Extensions] Remove the prompt to re-enable app when visiting its site

chrome/browser/extensions/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/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/common/features.gni")
 import("//extensions/features/features.gni")
 import("//media/media_options.gni")
 import("//rlz/features/features.gni")
@@ skipping 681 matching lines @@
     "installed_loader.cc",
     "installed_loader.h",
     "launch_util.cc",
     "launch_util.h",
     "location_bar_controller.cc",
     "location_bar_controller.h",
     "menu_manager.cc",
     "menu_manager.h",
     "menu_manager_factory.cc",
     "menu_manager_factory.h",
-    "navigation_observer.cc",
-    "navigation_observer.h",
     "ntp_overridden_bubble_delegate.cc",
     "ntp_overridden_bubble_delegate.h",
     "pack_extension_job.cc",
     "pack_extension_job.h",
     "path_util.cc",
     "path_util.h",
     "pending_extension_info.cc",
     "pending_extension_info.h",
     "pending_extension_manager.cc",
     "pending_extension_manager.h",
@@ skipping 468 matching lines @@
       "api/braille_display_private/brlapi_connection.cc",
       "api/braille_display_private/brlapi_connection.h",
       "api/braille_display_private/brlapi_keycode_map.cc",
       "api/braille_display_private/brlapi_keycode_map.h",
     ]
     deps += [ "//build/linux/libbrlapi" ]
   } else {
     sources += [ "api/braille_display_private/braille_controller_stub.cc" ]
   }
 }