Closure: remove older, original GYP compilation system

ui/webui/resources/js/cr/ui/compiled_resources.gyp

-# 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.
-{
-  'targets': [
-    {
-      'target_name': 'focus_manager',
-      'variables': {
-        'depends': [
-          '../../assert.js',
-          '../../compiled_resources.gyp:cr',
-        ],
-      },
-      'includes': ['../../../../../../third_party/closure_compiler/compile_js.gypi'],
-    },
-    {
-      'target_name': 'overlay',
-      'variables': {
-        'depends': [
-          '../../cr.js',
-          '../../promise_resolver.js',
-          '../../util.js',
-        ],
-        'externs': [
-          '../../../../../../third_party/closure_compiler/externs/chrome_send.js',
-        ],
-      },
-      'includes': ['../../../../../../third_party/closure_compiler/compile_js.gypi'],
-    },
-  ],
-}