Revert of Move vr features.gni into its own directory.

device/vr/features/BUILD.gn

Index: device/vr/features/BUILD.gn
diff --git a/device/vr/features/BUILD.gn b/device/vr/features/BUILD.gn
deleted file mode 100644
index e8afb4a3c2c1ff8e312c478d0f62416ca8abb5f8..0000000000000000000000000000000000000000
--- a/device/vr/features/BUILD.gn
+++ /dev/null
@@ -1,15 +0,0 @@
-# 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")
-
-# Generate a buildflag header for compile-time checking of WebVR support.
-buildflag_header("features") {
-  header = "features.h"
-  flags = [
-    "ENABLE_VR=$enable_vr",
-    "ENABLE_OPENVR=$enable_openvr",
-  ]
-}