Remove unnecessary dependencies on mojo/edk/system

device/vibration/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")
 
 component("vibration") {
   output_name = "device_vibration"
 
   sources = [
     "vibration_export.h",
     "vibration_manager_impl.h",
     "vibration_manager_impl_default.cc",
   ]
 
   defines = [ "DEVICE_VIBRATION_IMPLEMENTATION" ]
 
   deps = [
     ":mojo_bindings",
     "//base",
     "//base/third_party/dynamic_annotations",
-    "//mojo/edk/system",
     "//mojo/public/cpp/bindings",
   ]
 
   if (is_android) {
     sources -= [ "vibration_manager_impl_default.cc" ]
   }
 }
 
 mojom("mojo_bindings") {
   sources = [
     "vibration_manager.mojom",
   ]
 }