It used to be possible to navigate to a dnagerous file type to trigger its
download. Not anymore. Now all downloads where the user initiated it (by
navigating to a URL or clicking on a link) are not marked unsafe even for
unsafe filetypes.

Update the tests to trigger dangerous downloads by navigating to a file which
in turn triggers the dangerous files to download.

BUG=66081, 57875

Review URL: http://codereview.chromium.org/5781006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@69093 0039d316-1c4b-4281-b951-d872f2087c98

The dmg used need not be a valid one. Replacing the 10MB one with a 4K one.

BUG=
TEST=

Review URL: http://codereview.chromium.org/3397003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@59604 0039d316-1c4b-4281-b951-d872f2087c98

Added "dangerous downloads" files to data dir. Made sure the files were dangerous on each OS.

Review URL: http://codereview.chromium.org/3201004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@56911 0039d316-1c4b-4281-b951-d872f2087c98