[sensors] Fix component build warnings for windows platform

third_party/WebKit/Source/modules/sensor/BUILD.gn

 # Copyright 2016 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("//third_party/WebKit/Source/modules/modules.gni")
 
 blink_modules_sources("sensor") {
   sources = [
     "AmbientLightSensor.cpp",
     "AmbientLightSensor.h",
     "AmbientLightSensorReading.cpp",
     "AmbientLightSensorReading.h",
     "Sensor.cpp",
     "Sensor.h",
     "SensorErrorEvent.cpp",
     "SensorErrorEvent.h",
     "SensorPollingStrategy.cpp",
     "SensorPollingStrategy.h",
     "SensorProviderProxy.cpp",
     "SensorProviderProxy.h",
     "SensorProxy.cpp",
     "SensorProxy.h",
     "SensorReading.cpp",
     "SensorReading.h",
     "SensorReadingEvent.cpp",
     "SensorReadingEvent.h",
   ]
 
   deps = [
+    "//device/base/synchronization",
     "//device/generic_sensor/public/cpp",
     "//device/generic_sensor/public/interfaces:interfaces_blink",
   ]
 }