diff --git a/core/modules/link/src/Plugin/migrate/field/d7/LinkField.php b/core/modules/link/src/Plugin/migrate/field/d7/LinkField.php
index 7aeb142..bb71418 100644
--- a/core/modules/link/src/Plugin/migrate/field/d7/LinkField.php
+++ b/core/modules/link/src/Plugin/migrate/field/d7/LinkField.php
@@ -45,15 +45,4 @@ public function processFieldInstance(MigrationInterface $migration) {
     $migration->mergeProcessOfProperty('settings/title', $process);
   }
 
-  /**
-   * {@inheritdoc}
-   */
-  public function processFieldValues(MigrationInterface $migration, $field_name, $data) {
-    $process = [
-      'plugin' => 'field_link',
-      'source' => $field_name,
-    ];
-    $migration->mergeProcessOfProperty($field_name, $process);
-  }
-
 }
diff --git a/core/modules/link/src/Plugin/migrate/process/FieldLink.php b/core/modules/link/src/Plugin/migrate/process/FieldLink.php
index deb4150..e9ecd9c 100644
--- a/core/modules/link/src/Plugin/migrate/process/FieldLink.php
+++ b/core/modules/link/src/Plugin/migrate/process/FieldLink.php
@@ -18,8 +18,9 @@
  * All external URIs need to be converted to use a URI scheme.
  *
  * Available configuration keys
- * - uri_scheme: The URI scheme prefix to use for missing scheme urls. Defaults
- *   to 'http://', which was the default in Drupal 6 and Drupal 7.
+ * - uri_scheme: (optional) The URI scheme prefix to use for missing scheme
+ *   urls. Defaults to 'http://', which was the default in Drupal 6 and Drupal
+ *   7.
  *
  * Examples:
  *
diff --git a/core/modules/link/tests/src/Unit/Plugin/migrate/process/FieldLinkTest.php b/core/modules/link/tests/src/Unit/Plugin/migrate/process/FieldLinkTest.php
index ee8aaaf..005c072 100644
--- a/core/modules/link/tests/src/Unit/Plugin/migrate/process/FieldLinkTest.php
+++ b/core/modules/link/tests/src/Unit/Plugin/migrate/process/FieldLinkTest.php
@@ -18,7 +18,7 @@ class FieldLinkTest extends UnitTestCase {
    *
    * @dataProvider canonicalizeUriDataProvider
    */
-  public function testCanonicalizeUri($url, $expected, $configuration) {
+  public function testCanonicalizeUri($url, $expected, $configuration = []) {
     $link_plugin = new FieldLink($configuration, '', [], $this->getMock(MigrationInterface::class));
     $transformed = $link_plugin->transform([
       'url' => $url,
@@ -36,37 +36,30 @@ public function canonicalizeUriDataProvider() {
       'Simple front-page' => [
         '<front>',
         'internal:/',
-        [],
       ],
       'Front page with query' => [
         '<front>?query=1',
         'internal:/?query=1',
-        [],
       ],
       'No leading forward slash' => [
         'node/10',
         'internal:/node/10',
-        [],
       ],
       'Leading forward slash' => [
         '/node/10',
         'internal:/node/10',
-        [],
       ],
       'Existing scheme' => [
         'scheme:test',
         'scheme:test',
-        [],
       ],
       'Absolute URL with protocol prefix' => [
         'http://www.google.com',
         'http://www.google.com',
-        [],
       ],
       'Absolute URL without protocol prefix' => [
         'www.yahoo.com',
         'http://www.yahoo.com',
-        [],
       ],
       'Absolute URL without protocol prefix nor www' => [
         'yahoo.com',
@@ -76,7 +69,6 @@ public function canonicalizeUriDataProvider() {
       'Absolute URL with non-standard characters' => [
         'http://www.ßÀÑÐ¥ƒå¢ë.com',
         'http://www.ßÀÑÐ¥ƒå¢ë.com',
-        [],
       ],
     ];
   }