Remove font fallback hack for Windows layout tests

This was introduced in http://trac.webkit.org/changeset/29585 to override some
characters from default Times font.
In Chromium content_shell, default font of Windows is Times New Roman so those
@font-faces are no-op. Also, Windows does not have Lucida Grande by default.

BUG=

Review URL: https://chromiumcodereview.appspot.com/20999008

git-svn-id: svn://svn.chromium.org/blink/trunk@155303 bbb929c8-8fbe-4397-9dbb-9b2b20218538