Update to Drupal 8.0.0-rc3. For more information, see https://www.drupal.org/node/2608078

core/modules/file/file.libraries.yml

@@ -5,8 +5,6 @@ drupal.file:
   css:
     theme:
       css/file.admin.css: {}
-    component:
-      css/file.theme.css: {}
   dependencies:
     - core/jquery
     - core/jquery.once

core/modules/file/src/FileUsage/DatabaseFileUsageBackend.php

@@ -45,7 +45,7 @@ class DatabaseFileUsageBackend extends FileUsageBase {
   }
 
   /**
-   * Implements Drupal\file\FileUsage\FileUsageInterface::add().
+   * {@inheritdoc}
    */
   public function add(FileInterface $file, $module, $type, $id, $count = 1) {
     $this->connection->merge($this->tableName)
@@ -63,7 +63,7 @@ class DatabaseFileUsageBackend extends FileUsageBase {
   }
 
   /**
-   * Implements Drupal\file\FileUsage\FileUsageInterface::delete().
+   * {@inheritdoc}
    */
   public function delete(FileInterface $file, $module, $type = NULL, $id = NULL, $count = 1) {
     // Delete rows that have a exact or less value to prevent empty rows.
@@ -98,7 +98,7 @@ class DatabaseFileUsageBackend extends FileUsageBase {
   }
 
   /**
-   * Implements Drupal\file\FileUsage\FileUsageInterface::listUsage().
+   * {@inheritdoc}
    */
   public function listUsage(FileInterface $file) {
     $result = $this->connection->select($this->tableName, 'f')

core/modules/file/src/FileUsage/FileUsageBase.php

@@ -15,7 +15,7 @@ use Drupal\file\FileInterface;
 abstract class FileUsageBase implements FileUsageInterface {
 
   /**
-   * Implements Drupal\file\FileUsage\FileUsageInterface::add().
+   * {@inheritdoc}
    */
   public function add(FileInterface $file, $module, $type, $id, $count = 1) {
     // Make sure that a used file is permanent.
@@ -26,7 +26,7 @@ abstract class FileUsageBase implements FileUsageInterface {
   }
 
   /**
-   * Implements Drupal\file\FileUsage\FileUsageInterface::delete().
+   * {@inheritdoc}
    */
   public function delete(FileInterface $file, $module, $type = NULL, $id = NULL, $count = 1) {
     // If there are no more remaining usages of this file, mark it as temporary,

core/modules/file/src/Plugin/migrate/cckfield/FileField.php

@@ -8,10 +8,13 @@
 namespace Drupal\file\Plugin\migrate\cckfield;
 
 use Drupal\migrate\Entity\MigrationInterface;
+use Drupal\migrate\Row;
 use Drupal\migrate_drupal\Plugin\migrate\cckfield\CckFieldPluginBase;
 
 /**
- * @PluginID("filefield")
+ * @MigrateCckField(
+ *   id = "filefield"
+ * )
  */
 class FileField extends CckFieldPluginBase {
 
@@ -49,4 +52,11 @@ class FileField extends CckFieldPluginBase {
     $migration->mergeProcessOfProperty($field_name, $process);
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function getFieldType(Row $row) {
+    return $row->getSourceProperty('widget_type') == 'imagefield_widget' ? 'image' : 'file';
+  }
+
 }

core/modules/file/src/Plugin/migrate/destination/EntityFile.php

@@ -2,7 +2,7 @@
 
 /**
  * @file
- * Contains \Drupal\migrate\Plugin\migrate\destination\EntityFile.
+ * Contains \Drupal\file\Plugin\migrate\destination\EntityFile.
  */
 
 namespace Drupal\file\Plugin\migrate\destination;

core/modules/file/src/Plugin/views/wizard/File.php

@@ -26,7 +26,7 @@ class File extends WizardPluginBase {
   protected $createdColumn = 'created';
 
   /**
-   * Overrides Drupal\views\Plugin\views\wizard\WizardPluginBase::defaultDisplayOptions().
+   * {@inheritdoc}
    */
   protected function defaultDisplayOptions() {
     $display_options = parent::defaultDisplayOptions();