Make http_server part of the sdk.

mojo/services/http_server/public/interfaces/http_server.mojom

 // 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.
 
 module http_server;
 
-import "services/http_server/public/http_request.mojom";
-import "services/http_server/public/http_response.mojom";
+import "mojo/services/http_server/public/interfaces/http_request.mojom";
+import "mojo/services/http_server/public/interfaces/http_response.mojom";
 
 interface HttpServer {
   // Sets a handler for URLs matching a regex pattern. Handlers are considered
   // in the order they were registered.
   //
   // Returns false if there was already a handler registered for the given
   // pattern.
   //
   // To unregister a handler, destroy the underlying pipe.
   SetHandler(string pattern, HttpHandler handler) => (bool success);
 
   // Returns the TCP port at which the server is running. This will not return
   // until the server is ready, ie. listening for connections.
   GetPort() => (uint16 port);
 };
 
 interface HttpHandler {
   HandleRequest(HttpRequest request) => (HttpResponse response);
 };