Dispatch transfer size update notification on mojo-loading

net/test/url_request/url_request_mock_http_job.cc

Index: net/test/url_request/url_request_mock_http_job.cc
diff --git a/net/test/url_request/url_request_mock_http_job.cc b/net/test/url_request/url_request_mock_http_job.cc
index 5317b846ed0ce4f6d04f9e161e6d10e34e57f83c..7fdcfaaf9012a40a2b5dc61acd79fb4f55f0ada4 100644
--- a/net/test/url_request/url_request_mock_http_job.cc
+++ b/net/test/url_request/url_request_mock_http_job.cc
@@ -184,6 +184,7 @@ void URLRequestMockHTTPJob::SetHeadersAndStart(const std::string& raw_headers) {
   // ParseRawHeaders expects \0 to end each header line.
   base::ReplaceSubstringsAfterOffset(
       &raw_headers_, 0, "\n", base::StringPiece("\0", 1));
+  total_received_bytes_ += raw_headers_.size();
   URLRequestFileJob::Start();
 }