use \OC::$server->getPreviewManager() instead of \OCP\Preview

apps/files/ajax/rawlist.php

@@ -26,7 +26,7 @@ $files = array();
 if($mimetypes && !in_array('httpd/unix-directory', $mimetypes)) {
 	foreach( \OC\Files\Filesystem::getDirectoryContent( $dir, 'httpd/unix-directory' ) as $file ) {
 		$file['directory'] = $dir;
-		$file['isPreviewAvailable'] = \OCP\Preview::isMimeSupported($file['mimetype']);
+		$file['isPreviewAvailable'] = \OC::$server->getPreviewManager()->isMimeSupported($file['mimetype']);
 		$file["date"] = OCP\Util::formatDate($file["mtime"]);
 		$file['mimetype_icon'] = \OCA\files\lib\Helper::determineIcon($file);
 		$files[] = $file;
@@ -37,7 +37,7 @@ if (is_array($mimetypes) && count($mimetypes)) {
 	foreach ($mimetypes as $mimetype) {
 		foreach( \OC\Files\Filesystem::getDirectoryContent( $dir, $mimetype ) as $file ) {
 			$file['directory'] = $dir;
-			$file['isPreviewAvailable'] = \OCP\Preview::isMimeSupported($file['mimetype']);
+			$file['isPreviewAvailable'] = \OC::$server->getPreviewManager()->isMimeSupported($file['mimetype']);
 			$file["date"] = OCP\Util::formatDate($file["mtime"]);
 			$file['mimetype_icon'] = \OCA\files\lib\Helper::determineIcon($file);
 			$files[] = $file;
@@ -46,7 +46,7 @@ if (is_array($mimetypes) && count($mimetypes)) {
 } else {
 	foreach( \OC\Files\Filesystem::getDirectoryContent( $dir ) as $file ) {
 		$file['directory'] = $dir;
-		$file['isPreviewAvailable'] = \OCP\Preview::isMimeSupported($file['mimetype']);
+		$file['isPreviewAvailable'] = \OC::$server->getPreviewManager()->isMimeSupported($file['mimetype']);
 		$file["date"] = OCP\Util::formatDate($file["mtime"]);
 		$file['mimetype_icon'] = \OCA\files\lib\Helper::determineIcon($file);
 		$files[] = $file;

apps/files/lib/helper.php

@@ -84,7 +84,7 @@ class Helper
 				}
 			}
 			$i['directory'] = $dir;
-			$i['isPreviewAvailable'] = \OCP\Preview::isMimeSupported($i['mimetype']);
+			$i['isPreviewAvailable'] = \OC::$server->getPreviewManager()->isMimeSupported($i['mimetype']);
 			$i['icon'] = \OCA\files\lib\Helper::determineIcon($i);
 			$files[] = $i;
 		}

apps/files_sharing/public.php

@@ -187,7 +187,7 @@ if (isset($path)) {
 					} else {
 						$i['extension'] = '';
 					}
-					$i['isPreviewAvailable'] = \OCP\Preview::isMimeSupported($i['mimetype']);
+					$i['isPreviewAvailable'] = \OC::$server->getPreviewManager()->isMimeSupported($i['mimetype']);
 				}
 				$i['directory'] = $getPath;
 				$i['permissions'] = OCP\PERMISSION_READ;

apps/files_trashbin/lib/helper.php

@@ -61,7 +61,7 @@ class Helper
 				$i['directory'] = '';
 			}
 			$i['permissions'] = \OCP\PERMISSION_READ;
-			$i['isPreviewAvailable'] = \OCP\Preview::isMimeSupported($r['mime']);
+			$i['isPreviewAvailable'] = \OC::$server->getPreviewManager()->isMimeSupported($r['mime']);
 			$i['icon'] = \OCA\files\lib\Helper::determineIcon($i);
 			$files[] = $i;
 		}