Support .ico in Files.app.

BUG=295032

Review URL: https://codereview.chromium.org/106163012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239446 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239446
Cleanup: use !!window_resizer as is_dragged()
Always update DesktopVisibility in WLM::SetChildBounds.

BUG=none

Review URL: https://codereview.chromium.org/108873002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239447 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239447