Change font-weight-1 test to use webfonts

Change the font-weight-1 test to use web fonts instead of embedding the
font files into DRT. This fixes the test flakiness, makes it run on all
platforms and avoids the need to includ it into DRT.

BUG=243520,318515
R=dpranke@chromium.org

Review URL: https://codereview.chromium.org/110313004

git-svn-id: svn://svn.chromium.org/blink/trunk@164460 bbb929c8-8fbe-4397-9dbb-9b2b20218538