Revert of Update mojo sdk to rev afb4440fd5a10cba980878c326180b7ad7960480

mojo/services/public/interfaces/network/url_loader.mojom

Index: mojo/services/public/interfaces/network/url_loader.mojom
diff --git a/mojo/services/public/interfaces/network/url_loader.mojom b/mojo/services/public/interfaces/network/url_loader.mojom
index c1d2bd3b1249b55cf79d1aa26bc04548426c386e..b258fc4c4cba71757126dbceb78894f9638cdab0 100644
--- a/mojo/services/public/interfaces/network/url_loader.mojom
+++ b/mojo/services/public/interfaces/network/url_loader.mojom
@@ -8,17 +8,17 @@
 
 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
@@ -59,7 +59,7 @@
   string? status_line;
 
   // The HTTP response headers.
-  array<string>? headers;
+  array<string?>? headers;
 
   // The MIME type of the response body.
   string? mime_type;
@@ -92,13 +92,13 @@
   // 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);
 };