network: Fix a typo in URLLoaderCompletionStatus

This comment-only change removes a duplicated 'ERR_' from a comment in URLLoaderCompletionStatus.

R=mmenke

Bug: None
Change-Id: Ibd2a315ddf9a0a08a3c4ea99ce134c23a0435ad6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2552573
Commit-Queue: David Van Cleve <davidvc@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Auto-Submit: David Van Cleve <davidvc@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829788}

services/network/public/cpp/url_loader_completion_status.h

@@ -87,7 +87,7 @@ struct COMPONENT_EXPORT(NETWORK_CPP_BASE) URLLoaderCompletionStatus {
   base::Optional<net::SSLInfo> ssl_info;
 
   // More detailed reason for failing the response with
-  // ERR_net::ERR_BLOCKED_BY_RESPONSE |error_code|.
+  // net::ERR_BLOCKED_BY_RESPONSE |error_code|.
   base::Optional<mojom::BlockedByResponseReason> blocked_by_response_reason;
 
   // Set when response blocked by CORB needs to be reported to the DevTools