Fixes drag of images from new tab page. We need to pass in the mime type, otherwise webkit isn't able to get the mime type and we try and drag an image with a bogus name.
Fixes drag of images from new tab page. We need to pass in the mime
type, otherwise webkit isn't able to get the mime type and we try and
drag an image with a bogus name.

BUG=none
TEST=drag a thumbnail from the new tab to explorer. You should end up
     with a file named foo.png.

Review URL: http://codereview.chromium.org/21435

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@9967 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser