GitLab

Previously the existing Galley.app window do nothing when new entries are opened
in Files.app. This CL make the Gallery.app reopen its window.

BUG=358698
TEST=manually
R=mtomasz@chromium.org

Review URL: https://codereview.chromium.org/294593003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271356 0039d316-1c4b-4281-b951-d872f2087c98