Remove the mojo serial interfaces and related infrastructure.

extensions/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/features.gni")
 
 source_set("browser") {
   sources = []
 
   deps = [
@@ skipping 379 matching lines @@
     "extension_throttle_test_support.h",
     "extension_throttle_unittest.cc",
     "file_highlighter_unittest.cc",
     "file_reader_unittest.cc",
     "image_loader_unittest.cc",
     "info_map_unittest.cc",
     "lazy_background_task_queue_unittest.cc",
     "load_monitoring_extension_host_queue_unittest.cc",
     "management_policy_unittest.cc",
     "mojo/keep_alive_impl_unittest.cc",
-    "mojo/stash_backend_unittest.cc",
     "process_manager_unittest.cc",
     "process_map_unittest.cc",
     "quota_service_unittest.cc",
     "runtime_data_unittest.cc",
     "sandboxed_unpacker_unittest.cc",
     "updater/update_service_unittest.cc",
     "value_store/leveldb_scoped_database_unittest.cc",
     "value_store/leveldb_value_store_unittest.cc",
     "value_store/testing_value_store_unittest.cc",
     "value_store/value_store_change_unittest.cc",
@@ skipping 27 matching lines @@
     "//net:test_support",
     "//third_party/leveldatabase",
     "//third_party/zlib:zip",
   ]
 
   if (is_chromeos) {
     sources += [ "api/webcam_private/visca_webcam_unittest.cc" ]
     deps += [ "//chromeos:test_support" ]
   }
 }