newbitmaps: Remove Alex files and refer to specific branch.

Alex bitmaps cannot be generated by latest tools anymore, so let's remove the
resource files and refer to the correct place that contains everything you need
to generate a new Alex bitmap.

(Also see https://gerrit-int.chromium.org/#/c/23243/ for more information)

BUG=none
TEST=none, simply delete files.

Change-Id: I170071892df04ad1cf8304da506f2639a8f39b8b
Reviewed-on: https://gerrit.chromium.org/gerrit/29743
Reviewed-by: Bill Richardson <wfrichar@chromium.org>
Commit-Ready: Hung-Te Lin <hungte@chromium.org>
Tested-by: Hung-Te Lin <hungte@chromium.org>
226 files changed