Disable mixed content checks for some beacon WPT

We need to disable the feature to test referrer policy.

Bug: 732923
Change-Id: I4fab8a187b9947be05bac52d61391732dccd4a8d
Reviewed-on: https://chromium-review.googlesource.com/959412
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Adam Rice <ricea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542754}

third_party/WebKit/LayoutTests/external/wpt/beacon/headers/header-referrer-no-referrer-when-downgrade.https-expected.txt

-This is a testharness.js-based test.
-PASS Test referer header https://web-platform.test:8444/beacon/resources/
-FAIL Test referer header http://web-platform.test:8001/beacon/resources/ assert_true: SendBeacon Succeeded expected true got false
-Harness: the test ran to completion.
-

third_party/WebKit/LayoutTests/external/wpt/beacon/headers/header-referrer-strict-origin-when-cross-origin.https-expected.txt

-This is a testharness.js-based test.
-PASS Test referer header https://web-platform.test:8444/beacon/resources/
-FAIL Test referer header http://web-platform.test:8001/beacon/resources/ assert_true: SendBeacon Succeeded expected true got false
-Harness: the test ran to completion.
-

third_party/WebKit/LayoutTests/external/wpt/beacon/headers/header-referrer-strict-origin.https-expected.txt

-This is a testharness.js-based test.
-PASS Test referer header https://web-platform.test:8444/beacon/resources/
-FAIL Test referer header http://web-platform.test:8001/beacon/resources/ assert_true: SendBeacon Succeeded expected true got false
-Harness: the test ran to completion.
-

third_party/WebKit/LayoutTests/external/wpt/beacon/headers/header-referrer-unsafe-url.https-expected.txt

-This is a testharness.js-based test.
-FAIL Test referer header http://web-platform.test:8001/beacon/resources/ assert_true: SendBeacon Succeeded expected true got false
-Harness: the test ran to completion.
-

third_party/WebKit/LayoutTests/resources/testharnessreport.js

@@ -27,12 +27,21 @@
         testRunner.setCloseRemainingWindowsWhenComplete(true);
         testRunner.setDumpJavaScriptDialogs(false);
 
-        // fetch-event-referrer-policy.https.html intentionally loads mixed
-        // content in order to test the referrer policy, so
-        // WebKitAllowRunningInsecureContent must be set to true or else the
-        // load would be blocked.
-        if (document.URL.indexOf('service-workers/service-worker/fetch-event-referrer-policy.https.html') >= 0) {
+        // Some tests intentionally load mixed content in order to test the
+        // referrer policy, so WebKitAllowRunningInsecureContent must be set
+        // to true or else the load would be blocked.
+        const paths = [
+            'service-workers/service-worker/fetch-event-referrer-policy.https.html',
+            'beacon/headers/header-referrer-no-referrer-when-downgrade.https.html',
+            'beacon/headers/header-referrer-strict-origin-when-cross-origin.https.html',
+            'beacon/headers/header-referrer-strict-origin.https.html',
+            'beacon/headers/header-referrer-unsafe-url.https.html',
+        ];
+        for (const path of paths) {
+          if (document.URL.endsWith(path)) {
             testRunner.overridePreference('WebKitAllowRunningInsecureContent', true);
+            break;
+          }
         }
     }