[Downloads] Add real observers to MockDownloadItem.
Managing observer lists is needed by all the tests that end up calling DownloadItem::AddObserver. This CL adds real observers to MockDownloadItem so that tests don't need to mock this behavior. BUG=367311 Review URL: https://codereview.chromium.org/248713004 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269585 0039d316-1c4b-4281-b951-d872f2087c98
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