Settings: Open Privacy Sandbox page in a new tab.

This is a temporary workaround for crbug.com/1159942

Bug: 1152336
Change-Id: I58a55101e7344e756e694d8b8d213d33f8b1a88b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627394
Commit-Queue: Rainhard Findling <rainhard@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844874}

chrome/browser/resources/settings/privacy_page/privacy_page.html

@@ -58,6 +58,9 @@
             hidden="[[!enablePrivacySandboxSettings_]]"
             external
             role-description="$i18n{subpageArrowRoleDescription}"></cr-link-row>
+          <a id="privacySandboxLink" href="privacySandbox"
+              target="_blank" tabindex="-1" aria-disabled="true"
+              role="none"></a>
       </div>
 
 <if expr="use_nss_certs">

chrome/browser/resources/settings/privacy_page/privacy_page.js

@@ -315,9 +315,8 @@ Polymer({
 
   /** @private */
   onPrivacySandboxClick_() {
-    // TODO(crbug/1159942): Replace this with an ordinary OpenWindowProxy call
-    // once crbug/1159942 is fixed.
-    window.location = 'chrome://settings/privacySandbox';
+    // TODO(crbug/1159942): Replace this with an ordinary OpenWindowProxy call.
+    this.shadowRoot.getElementById('privacySandboxLink').click();
   },
 
   /** @private */