Add rpcexplorer to webapp hierarchy.

web/inc/rpcexplorer/rpc-explorer.html

Index: web/inc/rpcexplorer/rpc-explorer.html
diff --git a/server/static/rpcexplorer/rpc-explorer.html b/web/inc/rpcexplorer/rpc-explorer.html
similarity index 98%
copy from server/static/rpcexplorer/rpc-explorer.html
copy to web/inc/rpcexplorer/rpc-explorer.html
index 67a6febbc6c413458c5b5a6e6662d78035e5d7f0..2123f07d9c237309333a43f1a36b0b29f93b1808 100644
--- a/server/static/rpcexplorer/rpc-explorer.html
+++ b/web/inc/rpcexplorer/rpc-explorer.html
@@ -2,7 +2,7 @@
   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.
-  -->
+-->
 
 <link rel="import" href="../bower_components/app-router/app-router.html">
 <link rel="import" href="../bower_components/polymer/polymer.html">
@@ -14,7 +14,7 @@
     href="../bower_components/google-signin/google-signin-aware.html">
 <link rel="import" href="../bower_components/paper-spinner/paper-spinner.html">
 
-<link rel="import" href="/static/common/rpc/rpc-client.html">
+<link rel="import" href="../rpc/rpc-client.html">
 
 <link rel="import" href="rpc-descriptor-util.html">
 <link rel="import" href="rpc-method.html">
@@ -181,4 +181,4 @@
       }
     });
   </script>
-</dom-module>
+</dom-module>