Remove unnecessary dependencies on mojo/edk/system

device/battery/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")
 import("//mojo/public/tools/bindings/mojom.gni")
 
 # On android, BatteryManager mojo service is implemented directly in Java.
 if (!is_android) {
   component("battery") {
@@ skipping 13 matching lines @@
       "battery_status_service.cc",
       "battery_status_service.h",
     ]
 
     defines = [ "DEVICE_BATTERY_IMPLEMENTATION" ]
 
     deps = [
       ":mojo_bindings",
       "//base",
       "//base/third_party/dynamic_annotations",
-      "//mojo/edk/system",
       "//mojo/public/cpp/bindings",
     ]
 
     if (is_chromeos) {
       configs += [ "//build/config/linux/dbus" ]
       deps += [
         "//chromeos:chromeos",
         "//chromeos:power_manager_proto",
       ]
       sources -= [
@@ skipping 25 matching lines @@
     }
   }
 }
 
 mojom("mojo_bindings") {
   sources = [
     "battery_monitor.mojom",
     "battery_status.mojom",
   ]
 }