Fix double listing of vr_export.h in BUILD.gn

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("features.gni")
 import("//build/buildflag_header.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")  # For generate_jni().
@@ skipping 28 matching lines @@
     ]
   } else {
     sources += [
       "vr_device.cc",
       "vr_device.h",
       "vr_device_manager.cc",
       "vr_device_manager.h",
       "vr_device_provider.h",
       "vr_display_impl.cc",
       "vr_display_impl.h",
-      "vr_export.h",
       "vr_math.cc",
       "vr_math.h",
       "vr_service_impl.cc",
       "vr_service_impl.h",
       "vr_types.h",
     ]
 
     deps += [
       "//base",
       "//gpu/ipc/common:interfaces",
@@ skipping 69 matching lines @@
 
   public_deps = [
     "//gpu/ipc/common:interfaces",
     "//mojo/common:common_custom_types",
   ]
 
   export_class_attribute = "DEVICE_VR_EXPORT"
   export_define = "DEVICE_VR_IMPLEMENTATION=1"
   export_header = "device/vr/vr_export.h"
 }