Remove ENABLE_VR_SHELL compile-time define.

chrome/android/chrome_public_apk_tmpl.gni

 # Copyright 2015 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("//base/android/linker/config.gni")
 import("//build/config/android/rules.gni")
 import("//build/config/locales.gni")
 import("//chrome/common/features.gni")
 import("//third_party/leakcanary/config.gni")
 import("channel.gni")
@@ skipping 13 matching lines @@
       chromium_linker_supported &&
       (current_cpu == "arm64" || current_cpu == "x64")
 
   # Enables ProGuard obfuscation of Chromium packages.
   enable_proguard_obfuscation = false
 }
 
 default_chrome_public_jinja_variables = [
   "channel=$android_channel",
   "enable_leakcanary=$enable_leakcanary",
-  "enable_vr_shell=$enable_vr_shell",
   "enable_webvr=$enable_webvr",
 ]
 
 template("chrome_public_apk_tmpl") {
   android_apk(target_name) {
     forward_variables_from(invoker, "*")
     _native_lib_file =
         rebase_path("$root_gen_dir/CHROME_VERSION.json", root_out_dir)
     native_lib_version_arg = "@FileArg($_native_lib_file:full-quoted)"
     native_lib_version_rule = "//build/util:chrome_version_json"
@@ skipping 80 matching lines @@
     ]
 
     if (!is_java_debug) {
       if (!defined(proguard_configs)) {
         proguard_configs = []
       }
       proguard_configs += [ "//android_webview/apk/java/proguard.flags" ]
     }
   }
 }