Add missing files in //device to appropriate BUILD.gn files.

device/power_save_blocker/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("//build/config/features.gni")
 import("//build/config/ui.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
 component("power_save_blocker") {
   sources = [
     "power_save_blocker.h",
     "power_save_blocker_android.cc",
     "power_save_blocker_android.h",
     "power_save_blocker_chromeos.cc",
+    "power_save_blocker_export.h",
     "power_save_blocker_mac.cc",
     "power_save_blocker_ozone.cc",
     "power_save_blocker_win.cc",
     "power_save_blocker_x11.cc",
   ]
 
   defines = [ "DEVICE_POWER_SAVE_BLOCKER_IMPLEMENTATION" ]
 
   deps = [
     "//base",
@@ skipping 55 matching lines @@
   }
 
   android_library("java") {
     java_files = java_sources_needing_jni
     deps = [
       "//base:base_java",
       "//ui/android:ui_java",
     ]
   }
 }