If you carefully read the document of - https://www.drupal.org/project/oauth...

If you carefully read the document of - https://www.drupal.org/project/oauth_common, you will find the module is moved to https://www.drupal.org/project/oauth which is the same module. your dependency of oauth_common will be fulfilled by that module, And One more thing that FlickrGallery doesn't require to mention that dependency because https://www.drupal.org/project/flickrapi has that dependency.