revert: Reverts changes from #378

Post-release, users discovered problems with `UploadedFile` extending
`SplFileInfo`, particularly when a stream path is used to create the
instance. Additionally, there are some differences with how
`UploadedFileInterface` and `SplFileInfo` each define the return type
for `getSize()`; the former allows nullification, while the latter does
not, but allows raising an exception (something explicitly
disallowed in PSR-7).

This patch reverts the code and documentation changes associated with
the patch.

docs/book/v2/api.md

@@ -194,6 +194,4 @@ In most cases, you will not interact with the Stream object directly.
 and provides abstraction around a single uploaded file, including behavior for interacting with it
 as a stream or moving it to a filesystem location.
 
-Additionally, it extends PHP's build in `SplFileInfo` object in order to provide a compatible interface wherever such an object is needed.
-
 In most cases, you will only use the methods defined in the `UploadedFileInterface`.

src/UploadedFile.php

@@ -9,7 +9,6 @@
 
 namespace Zend\Diactoros;
 
-use SplFileInfo;
 use Psr\Http\Message\StreamInterface;
 use Psr\Http\Message\UploadedFileInterface;
 
@@ -36,7 +35,7 @@
 use const UPLOAD_ERR_OK;
 use const UPLOAD_ERR_PARTIAL;
 
-class UploadedFile extends SplFileInfo implements UploadedFileInterface
+class UploadedFile implements UploadedFileInterface
 {
     const ERROR_MESSAGES = [
         UPLOAD_ERR_OK         => 'There is no error, the file uploaded with success',
@@ -103,13 +102,9 @@ public function __construct(
         if ($errorStatus === UPLOAD_ERR_OK) {
             if (is_string($streamOrFile)) {
                 $this->file = $streamOrFile;
-
-                parent::__construct($this->file);
             }
             if (is_resource($streamOrFile)) {
                 $this->stream = new Stream($streamOrFile);
-
-                parent::__construct($this->stream->getMetaData('uri'));
             }
 
             if (! $this->file && ! $this->stream) {

test/UploadedFileTest.php

@@ -13,7 +13,6 @@
 use PHPUnit\Framework\TestCase;
 use ReflectionProperty;
 use RuntimeException;
-use SplFileInfo;
 use Zend\Diactoros\Stream;
 use Zend\Diactoros\UploadedFile;
 
@@ -326,13 +325,4 @@ public function testMoveToRaisesExceptionWithAppropriateMessageWhenUploadErrorDe
         $this->expectExceptionMessage($message);
         $uploadedFile->moveTo('/tmp/foo');
     }
-
-    /**
-     * @see https://github.com/zendframework/zend-diactoros/pull/378
-     */
-    public function testExtendsSplFileInfo()
-    {
-        $uploaded = new UploadedFile(fopen('php://temp', 'wb+'), 0, UPLOAD_ERR_OK);
-        $this->assertInstanceOf(SplFileInfo::class, $uploaded);
-    }
 }