GTK: lighten the color of the download item status/label text.
GTK: lighten the color of the download item status/label text.

This doesn't use the same technique as windows/mac, which both draw the text first, then draw the download item shading over it. To do that for GTK results in very delicate and complicated code, so instead I just alpha-blended the text color manually with hard-coded values.

BUG=21176
TEST=see bug

Review URL: http://codereview.chromium.org/598033

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@38684 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