Bug 1537730 [wpt PR 15864] - Add reporting.idl as a dep for CSP idlharness.js tests, a=testonly

Automatic update from web-platform-tests
Add reporting.idl as a dep for CSP idlharness.js tests (#15864)

Needed for https://github.com/web-platform-tests/wpt/pull/15856.
--

wpt-commits: d779352beb7f08f4970ab1512c8e5ac9ff8cded6
wpt-pr: 15864

testing/web-platform/tests/content-security-policy/securitypolicyviolation/idlharness.window.js

@@ -7,7 +7,7 @@
 
 idl_test(
   ['CSP'],
-  ['dom'],
+  ['dom', 'reporting'],
   idl_array => {
     idl_array.add_objects({
       SecurityPolicyViolationEvent: [