Remove unnecessary dependencies on mojo/edk/system

device/vr/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("//mojo/public/tools/bindings/mojom.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")  # For generate_jni().
 }
 
 component("vr") {
   output_name = "device_vr"
 
   sources = [
     "vr_device.cc",
     "vr_device.h",
     "vr_device_manager.cc",
     "vr_device_manager.h",
     "vr_device_provider.h",
   ]
 
   deps = [
     ":mojo_bindings",
     "//base",
-    "//mojo/edk/system",
     "//mojo/public/cpp/bindings",
     "//third_party/WebKit/public:mojo_bindings",
     "//ui/gfx",
   ]
 
   defines = [ "DEVICE_VR_IMPLEMENTATION" ]
 
   if (is_android) {
     sources += [
       "android/cardboard/cardboard_vr_device.cc",
@@ skipping 44 matching lines @@
   }
 
   android_library("java") {
     java_files = java_sources_needing_jni
     deps = [
       "//base:base_java",
       "//third_party/cardboard-java:cardboard-java",
     ]
   }
 }