Move OneWriterSeqLock and SharedMemorySeqLockBuffer from content/ to device/base/synchronization

device/BUILD.gn

 # Copyright 2015 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("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")  # For generate_jni().
 }
 
 if (is_mac) {
   import("//build/config/mac/mac_sdk.gni")
 }
 
 is_linux_without_udev = is_linux && !use_udev
 
 test("device_unittests") {
   sources = [
+    "base/synchronization/one_writer_seqlock_unittest.cc",
     "battery/battery_status_manager_win_unittest.cc",
     "battery/battery_status_service_unittest.cc",
     "bluetooth/bluetooth_adapter_mac_unittest.mm",
     "bluetooth/bluetooth_adapter_unittest.cc",
     "bluetooth/bluetooth_adapter_win_unittest.cc",
     "bluetooth/bluetooth_advertisement_unittest.cc",
     "bluetooth/bluetooth_device_unittest.cc",
     "bluetooth/bluetooth_device_win_unittest.cc",
     "bluetooth/bluetooth_discovery_filter_unittest.cc",
     "bluetooth/bluetooth_local_gatt_characteristic_unittest.cc",
@@ skipping 29 matching lines @@
     "bluetooth/test/test_bluetooth_adapter_observer.h",
     "bluetooth/test/test_bluetooth_local_gatt_service_delegate.cc",
     "bluetooth/test/test_bluetooth_local_gatt_service_delegate.h",
     "gamepad/gamepad_provider_unittest.cc",
     "generic_sensor/platform_sensor_provider_unittest.cc",
     "test/run_all_unittests.cc",
   ]
 
   deps = [
     "//base/test:test_support",
+    "//base/third_party/dynamic_annotations:dynamic_annotations",
+    "//device/base/synchronization",
     "//device/battery",
     "//device/battery:mojo_bindings",
     "//device/bluetooth",
     "//device/bluetooth:mocks",
     "//device/gamepad",
     "//device/gamepad:test_helpers",
     "//device/generic_sensor",
     "//device/generic_sensor:testing",
     "//device/geolocation:unittests",
     "//device/power_save_blocker",
@@ skipping 192 matching lines @@
     ]
     srcjar_deps = [ "//device/gamepad:java_enums_srcjar" ]
   }
 
   java_cpp_enum("bluetooth_test_javagen") {
     sources = [
       "bluetooth/test/bluetooth_test.h",
     ]
   }
 }