Add rpcexplorer to webapp hierarchy.

web/inc/rpcexplorer/test/descriptor.html

 <!--
   Copyright 2016 The LUCI Authors. All rights reserved.
   Use of this source code is governed under the Apache License, Version 2.0
   that can be found in the LICENSE file.
-  -->
+-->
 
 <!-- This file is generated by gen.go -->
 
 <script>
 var testDescriptor = {
   "file": [
     {
       "name": "types.proto",
       "package": "rpcexplorer",
       "messageType": [
@@ skipping 175 matching lines @@
           {
             "path": [
               12
             ],
             "span": [
               4,
               0,
               18
             ],
             "leadingDetachedComments": [
-              " Copyright 2016 The LUCI Authors. All rights reserved.\n Use of this source code is governed under the Apache License, Version 2.0\n that can be found in the LICENSE file.\n"
+              " Copyright 2016 The Chromium Authors. All rights reserved.\n Use of this source code is governed by a BSD-style license that can be\n found in the LICENSE file.\n"
             ]
           },
           {
             "path": [
               2
             ],
             "span": [
               6,
               8,
               19
@@ skipping 973 matching lines @@
               22
             ]
           }
         ]
       },
       "syntax": "proto3"
     }
   ]
 };
 </script>