Warn users about potentially unwanted downloads.
Exposes POTENTIALLY_UNWANTED ClientDownloadResponse verdict from the
SafeBrowsing service to ChromeDownloadManagerDelegate. Downloads for
which this verdict is seen will be marked with the danger type
DOWNLOAD_DANGER_TYPE_POTENTIALLY_UNWANTED.
A dangerous download prompt will be displayed on the download shelf
indicating that the download may make changes to the browser or
system.
Changes are for Windows only since the POTENTIALLY_UNWANTED signal is
only implemented for Windows.
BUG=262983
Review URL: https://chromiumcodereview.appspot.com/
19863005
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@213289 0039d316-1c4b-4281-b951-d872f2087c98