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Also, on linux, assume the user denies every download which we would have prompted him with.

BUG=12709
TEST=windows is still carpet-bombing resilient and linux can download from the same page more than once.
Review URL: http://codereview.chromium.org/113925

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@17089 0039d316-1c4b-4281-b951-d872f2087c98