[credentialsmanager] Remove redundant tests

third_party/WebKit/LayoutTests/http/tests/credentialmanager/resources/interfaces.js

Index: third_party/WebKit/LayoutTests/http/tests/credentialmanager/resources/interfaces.js
diff --git a/third_party/WebKit/LayoutTests/http/tests/credentialmanager/resources/interfaces.js b/third_party/WebKit/LayoutTests/http/tests/credentialmanager/resources/interfaces.js
deleted file mode 100644
index eb00df65ff3b7b709a2c603cd7be21f765ec5f40..0000000000000000000000000000000000000000
--- a/third_party/WebKit/LayoutTests/http/tests/credentialmanager/resources/interfaces.js
+++ /dev/null
@@ -1,15 +0,0 @@
-function verify_interface(name, instance, attributes) {
-  assert_true(name in self,
-              name + ' should be an defined type');
-  if (instance) {
-    assert_true(instance instanceof self[name],
-                instance + ' should be an instance of ' + name);
-    Object.keys(attributes || {}).forEach(function(attribute) {
-        var type = attributes[attribute];
-        assert_true(attribute in instance,
-                    attribute + ' should be an attribute of ' + name);
-        assert_equals(typeof instance[attribute], type,
-                      attribute + ' should be of type ' + type);
-      });
-  }
-}