[credentialsmanager] Remove redundant tests

third_party/WebKit/LayoutTests/http/tests/credentialmanager/credentialscontainer-get-basics.html

Index: third_party/WebKit/LayoutTests/http/tests/credentialmanager/credentialscontainer-get-basics.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/credentialmanager/credentialscontainer-get-basics.html b/third_party/WebKit/LayoutTests/http/tests/credentialmanager/credentialscontainer-get-basics.html
index a27e31784078d6002ebc710a8b2adde6010f42e4..4ce442369ade80441a977205f5031964da16972f 100644
--- a/third_party/WebKit/LayoutTests/http/tests/credentialmanager/credentialscontainer-get-basics.html
+++ b/third_party/WebKit/LayoutTests/http/tests/credentialmanager/credentialscontainer-get-basics.html
@@ -2,7 +2,6 @@
 <title>Credential Manager: get() basics.</title>
 <script src="../resources/testharness.js"></script>
 <script src="../resources/testharnessreport.js"></script>
-<script src="resources/interfaces.js"></script>
 <script>
 function stubResolverUndefinedChecker(c) {
     assert_equals(c, undefined);
@@ -130,12 +129,6 @@ add_completion_callback(() => {
     var password = "pencil";
 
     function stubResolverChecker(c) {
-        verify_interface('PasswordCredential', c, {
-            id: 'string',
-            name: 'string',
-            iconURL: 'string'
-        });
-
         assert_equals(c.id, id);
         assert_equals(c.name, name);
         assert_equals(c.iconURL, icon);