Revert 251163 "Set a reasonable icon for the media galleries sca..."

> Set a reasonable icon for the media galleries scan result dialog folder viewer.
> 
> BUG=334309,161119
> NOTRY=true
> 
> Review URL: https://codereview.chromium.org/130263007

TBR=vandebo@chromium.org

Review URL: https://codereview.chromium.org/164373003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251171 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 251171