Change DumpRenderTree_resources to use ui_resources_100_percent.pak.

This should help address the TODO ui/resources/ui_resources.grd and
ui/ui_resources.gypi on Chromium. Once this lands and rolls on Chromium,
then we can update on the Chromium side.

R=abarth@chromium.org,oshima@chromium.org

Review URL: https://chromiumcodereview.appspot.com/23033006

git-svn-id: svn://svn.chromium.org/blink/trunk@156259 bbb929c8-8fbe-4397-9dbb-9b2b20218538