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When downloading a url, the state of the BackgroundDownloader must be
reset.

A better solution later on would be implementing a BitsFetcher that can
only do one download, similar to UrlFetcher. This avoids the situation
when dirty state post-download is carried over to a subsequent
download.

BUG=304354

Review URL: https://codereview.chromium.org/102993014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242108 0039d316-1c4b-4281-b951-d872f2087c98