Revert "Share code between FontPlatformDataWin and FontPlatformDataHarfBuzz"

This reverts commit r170801 (e4758b88d6c51a68bd81c647560471c14c807629)
as it likely caused an android build failure.

TBR=rafaelw@chromium.org
BUG=

Review URL: https://codereview.chromium.org/224903002

git-svn-id: svn://svn.chromium.org/blink/trunk@170805 bbb929c8-8fbe-4397-9dbb-9b2b20218538