Allow the gallery url passed through the command line to be referrer for actual gallery downloads.
Allow the gallery url passed through the command line to be referrer for actual gallery downloads.

BUG=None
TEST=Pass in a gallery url through the command line and make sure the dangerous download warning does not show when downloading from that gallery.

Review URL: http://codereview.chromium.org/1997019

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@47033 0039d316-1c4b-4281-b951-d872f2087c98

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