Revert of Update mojo sdk to rev afb4440fd5a10cba980878c326180b7ad7960480

mojo/services/public/interfaces/network/url_loader.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 mojo;
 
 import "mojo/services/public/interfaces/network/network_error.mojom";
 
 struct URLRequest {
   // The URL to load.
-  string url;
+  string? url;
 
   // The HTTP method if applicable.
-  string method = "GET";
+  string? method = "GET";
 
   // Additional HTTP request headers.
-  array<string>? headers;
+  array<string?>? headers;
 
   // The payload for the request body, represented as a concatenation of data
   // streams. For HTTP requests, the method must be set to "POST" or "PUT".
-  array<handle<data_pipe_consumer>>? body;
+  array<handle<data_pipe_consumer>?>? body;
 
   // The number of bytes to be read from |body|. A Content-Length header of
   // this value will be sent. Set to -1 if length is unknown, which will cause
   // |body| to be uploaded using a chunked encoding.
   int64 body_length = 0;
 
   // The buffer size of the data pipe returned in URLResponse's |body| member.
   // A value of 0 indicates that the default buffer size should be used.  This
   // value is just a suggestion. The URLLoader may choose to ignore this value.
   uint32 response_body_buffer_size = 0;
@@ skipping 20 matching lines @@
   // The final URL of the response, after redirects have been followed.
   string? url;
 
   // The HTTP status code. 0 if not applicable.
   uint32 status_code;
 
   // The HTTP status line.
   string? status_line;
 
   // The HTTP response headers.
-  array<string>? headers;
+  array<string?>? headers;
 
   // The MIME type of the response body.
   string? mime_type;
 
   // The character set of the response body.
   string? charset;
 
   // These fields are set to non-NULL if this response corresponds to a
   // redirect.  Call the |FollowRedirect| method on the URLLoader instance to
   // follow this redirect.
@@ skipping 12 matching lines @@
   bool is_loading;
 
   // TODO(darin): Add further details about the stages of loading (e.g.,
   // "resolving host") that happen prior to receiving bytes.
 };
 
 interface URLLoader {
   // Loads the given |request|, asynchronously producing |response|. Consult
   // |response| to determine if the request resulted in an error, was
   // redirected, or has a response body to be consumed.
-  Start(URLRequest request) => (URLResponse response);
+  Start(URLRequest? request) => (URLResponse? response);
 
   // If the request passed to |Start| had |auto_follow_redirects| set to false,
   // then upon receiving an URLResponse with a non-NULL |redirect_url| field,
   // |FollowRedirect| may be called to load the URL indicated by the redirect.
-  FollowRedirect() => (URLResponse response);
+  FollowRedirect() => (URLResponse? response);
 
   // Query status about the URLLoader.
-  QueryStatus() => (URLLoaderStatus status);
+  QueryStatus() => (URLLoaderStatus? status);
 };