Remove MTP support on Linux.

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 3482 matching lines @@
       "../browser/download/download_commands_unittest.cc",
       "../browser/download/download_shelf_unittest.cc",
       "../browser/first_run/first_run_unittest.cc",
       "../browser/font_family_cache_unittest.cc",
       "../browser/importer/firefox_profile_lock_unittest.cc",
       "../browser/importer/profile_writer_unittest.cc",
       "../browser/media/combined_desktop_media_list_unittest.cc",
       "../browser/media/webrtc/tab_desktop_media_list_unittest.cc",
       "../browser/media_galleries/fileapi/native_media_file_util_unittest.cc",
       "../browser/media_galleries/gallery_watch_manager_unittest.cc",
-      "../browser/media_galleries/linux/mtp_device_object_enumerator_unittest.cc",
       "../browser/media_galleries/mac/mtp_device_delegate_impl_mac_unittest.mm",
       "../browser/media_galleries/media_file_system_registry_unittest.cc",
       "../browser/media_galleries/media_galleries_dialog_controller_mock.cc",
       "../browser/media_galleries/media_galleries_dialog_controller_mock.h",
       "../browser/media_galleries/media_galleries_dialog_controller_test_util.cc",
       "../browser/media_galleries/media_galleries_dialog_controller_test_util.h",
       "../browser/media_galleries/media_galleries_permission_controller_unittest.cc",
       "../browser/media_galleries/media_galleries_permissions_unittest.cc",
       "../browser/media_galleries/media_galleries_preferences_unittest.cc",
       "../browser/media_galleries/win/mtp_device_delegate_impl_win_unittest.cc",
@@ skipping 334 matching lines @@
       "../browser/extensions/updater/extension_cache_fake.cc",
       "../browser/extensions/updater/extension_cache_fake.h",
       "../browser/extensions/updater/extension_updater_unittest.cc",
       "../browser/extensions/user_script_listener_unittest.cc",
       "../browser/extensions/warning_badge_service_unittest.cc",
       "../browser/extensions/webstore_inline_installer_unittest.cc",
       "../browser/extensions/webstore_installer_unittest.cc",
       "../browser/extensions/zipfile_installer_unittest.cc",
       "../browser/media/cast_remoting_sender_unittest.cc",
       "../browser/media/cast_transport_host_filter_unittest.cc",
+      "../browser/media_galleries/chromeos/mtp_device_object_enumerator_unittest.cc",
       "../browser/metrics/extensions_metrics_provider_unittest.cc",
       "../browser/notifications/extension_welcome_notification_unittest.cc",
       "../browser/notifications/notification_conversion_helper_unittest.cc",
       "../browser/renderer_context_menu/context_menu_content_type_unittest.cc",
       "../browser/search/hotword_service_unittest.cc",
       "../browser/signin/easy_unlock_app_manager_unittest.cc",
       "../browser/signin/easy_unlock_auth_attempt_unittest.cc",
       "../browser/signin/easy_unlock_screenlock_state_handler_unittest.cc",
       "../browser/signin/easy_unlock_service_unittest_chromeos.cc",
       "../browser/signin/mutable_profile_oauth2_token_service_delegate_unittest.cc",
@@ skipping 1135 matching lines @@
       "touch_hud",
       "ui",
     ]
 
     if (is_linux && !is_android) {
       deps += [ "//components/font_service:manifest" ]
       packaged_services += [ "font_service" ]
     }
   }
 }