Make http_server part of the sdk.

services/http_server/public/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";
-
-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);
-};