Move file_handlers API from //chrome to //extensions

chrome/test/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/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/common/features.gni")
@@ skipping 3858 matching lines @@
       "../browser/extensions/api/device_permissions_manager_unittest.cc",
       "../browser/extensions/api/dial/device_description_fetcher_unittest.cc",
       "../browser/extensions/api/dial/dial_device_data_unittest.cc",
       "../browser/extensions/api/dial/dial_registry_unittest.cc",
       "../browser/extensions/api/dial/dial_service_unittest.cc",
       "../browser/extensions/api/downloads/downloads_api_unittest.cc",
       "../browser/extensions/api/easy_unlock_private/easy_unlock_private_api_chromeos_unittest.cc",
       "../browser/extensions/api/experience_sampling_private/experience_sampling_private_api_unittest.cc",
       "../browser/extensions/api/extension_action/browser_action_unittest.cc",
       "../browser/extensions/api/extension_action/extension_action_prefs_unittest.cc",
-      "../browser/extensions/api/file_handlers/api_file_handler_util_unittest.cc",
-      "../browser/extensions/api/file_handlers/directory_util_unittest.cc",
-      "../browser/extensions/api/file_handlers/mime_util_unittest.cc",
       "../browser/extensions/api/file_system/file_system_api_unittest.cc",
       "../browser/extensions/api/identity/extension_token_key_unittest.cc",
       "../browser/extensions/api/identity/gaia_web_auth_flow_unittest.cc",
       "../browser/extensions/api/identity/identity_mint_queue_unittest.cc",
       "../browser/extensions/api/image_writer_private/destroy_partitions_operation_unittest.cc",
       "../browser/extensions/api/image_writer_private/operation_manager_unittest.cc",
       "../browser/extensions/api/image_writer_private/operation_unittest.cc",
       "../browser/extensions/api/image_writer_private/removable_storage_provider_chromeos_unittest.cc",
       "../browser/extensions/api/image_writer_private/test_utils.cc",
       "../browser/extensions/api/image_writer_private/write_from_file_operation_unittest.cc",
@@ skipping 1283 matching lines @@
 }
 
 if (is_win) {
   loadable_module("conflicts_dll") {
     testonly = true
     sources = [
       "conflicts/conflicts_dll.cc",
     ]
   }
 }