Add most missing blink files to .gn files

third_party/WebKit/Source/modules/device_light/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("device_light") {
   sources = [
+    "DOMWindowDeviceLight.h",
     "DeviceLightController.cpp",
     "DeviceLightController.h",
     "DeviceLightDispatcher.cpp",
     "DeviceLightDispatcher.h",
     "DeviceLightEvent.cpp",
     "DeviceLightEvent.h",
   ]
 }