URLRequestHttpJob::StartTransaction should honour network delegate.

net/url_request/url_request_http_job.cc

Index: net/url_request/url_request_http_job.cc
diff --git a/net/url_request/url_request_http_job.cc b/net/url_request/url_request_http_job.cc
index 309f0fba8e281494b2c214cc74bfa3f5f1254945..2273c139a0384d9a8a23508324988f0a02a0e56b 100644
--- a/net/url_request/url_request_http_job.cc
+++ b/net/url_request/url_request_http_job.cc
@@ -342,11 +342,13 @@ void URLRequestHttpJob::StartTransaction() {
         request_, notify_before_headers_sent_callback_,
         &request_info_.extra_headers);
     // If an extension blocks the request, we rely on the callback to
-    // StartTransactionInternal().
+    // MaybeStartTransactionInternal().
     if (rv == ERR_IO_PENDING) {
       SetBlockedOnDelegate();
       return;
     }
+    MaybeStartTransactionInternal(rv);
+    return;
   }
   StartTransactionInternal();
 }
@@ -357,6 +359,10 @@ void URLRequestHttpJob::NotifyBeforeSendHeadersCallback(int result) {
   // Check that there are no callbacks to already canceled requests.
   DCHECK_NE(URLRequestStatus::CANCELED, GetStatus().status());
 
+  MaybeStartTransactionInternal(result);
+}
+
+void URLRequestHttpJob::MaybeStartTransactionInternal(int result) {
   if (result == OK) {
     StartTransactionInternal();
   } else {
@@ -364,6 +370,7 @@ void URLRequestHttpJob::NotifyBeforeSendHeadersCallback(int result) {
     request_->net_log().AddEvent(NetLog::TYPE_CANCELLED,
                                  NetLog::StringCallback("source", &source));
     NotifyCanceled();
+    NotifyStartError(URLRequestStatus(URLRequestStatus::FAILED, result));
   }
 }