getStorage belongs to files not to apps.

apps/contacts/ajax/uploadimport.php

 	OCP\Util::writeLog('contacts','ajax/uploadimport.php: '.$msg, OCP\Util::DEBUG);
 }
 
-$view = OCP\App::getStorage('contacts');
+$view = OCP\Files::getStorage('contacts');
 $tmpfile = md5(rand());
 
 // If it is a Drag'n'Drop transfer it's handled here.

apps/contacts/import.php

 writeProgress('10');
 $view = $file = null;
 if(isset($_POST['fstype']) && $_POST['fstype'] == 'OC_FilesystemView') {
-	$view = OCP\App::getStorage('contacts');
+	$view = OCP\Files::getStorage('contacts');
 	$file = $view->file_get_contents('/' . $_POST['file']);
 } else {
 	$file = OC_Filesystem::file_get_contents($_POST['path'] . '/' . $_POST['file']);

lib/public/app.php

 	}
 
 
-        /**
-         * @param string appid
-         * @param $app app
-         * @return OC_FilesystemView
-         */
-        public static function getStorage( $app ){
-		return \OC_App::getStorage( $app );
-	}
-
 
 }
 

lib/public/files.php

 		return(\OC_Helper::buildNotExistingFileName( $path, $filename ));
 	}
 
+        /**
+         * @param string appid
+         * @param $app app
+         * @return OC_FilesystemView
+         */
+        public static function getStorage( $app ){
+		return \OC_App::getStorage( $app );
+	}
+