Bug 1424076 - P2 adjust Origin header comparison for POST request r=Honza

We'd like to enable the Origin header for all eligible reqeusts, which include POST.
The test should be adjusted.

Differential Revision: https://phabricator.services.mozilla.com/D33382

--HG--
extra : moz-landing-system : lando

devtools/client/netmonitor/test/browser_net_copy_as_curl.js

@@ -48,6 +48,9 @@ add_task(async function() {
     "--data " + quote(POST_PAYLOAD),
     header("Content-Type: text/plain;charset=UTF-8"),
   ];
+  const ORIGIN_RESULT = [
+    header("Origin: http://example.com"),
+  ];
 
   const HEAD_PARTIAL_RESULT = ["-I"];
 
@@ -85,6 +88,7 @@ add_task(async function() {
     ...BASE_RESULT,
     ...COOKIE_PARTIAL_RESULT,
     ...POST_PARTIAL_RESULT,
+    ...ORIGIN_RESULT,
   ]);
 
   // HEAD request