Update saml_password_attributes_test.unitjs path

The file was moved to chrome/browser/resources/gaia_auth_host/
saml_password_attributes_test.unitjs

Change-Id: Ie4763473632202a383a058ed9858a364d779cfac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2073765Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Anastasiia Nikolaienko <anastasiian@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744623}

docs/testing/writing_js_unit_tests.md

@@ -366,7 +366,7 @@ examples. Here are some useful examples:
 [oobe_webui_browsertest.js](https://cs.chromium.org/chromium/src/chrome/test/data/chromeos/oobe_webui_browsertest.js) -
 makes the browser fullscreen before running the JS test.
 
-[saml_password_attributes_test.unitjs](https://cs.chromium.org/chromium/src/chrome/browser/resources/chromeos/login/saml_password_attributes_test.unitjs) -
+[saml_password_attributes_test.unitjs](https://cs.chromium.org/chromium/src/chrome/browser/resources/gaia_auth_host/saml_password_attributes_test.unitjs) -
 loads an XML file into a JS global variable before running the JS test.
 
 Another thing that will make your life a little bit easier is being able to