Remove unnecessary includes from FontPlatformDataWin.cpp

Remove a bunch of include statements from FontPlatformDataWin.cpp that
are no longer needed.

TBR=leviw@chromium.org

Review URL: https://codereview.chromium.org/224543002

git-svn-id: svn://svn.chromium.org/blink/trunk@170927 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Refactoring editing/selection/13804.html

This test does not need pixel baselines (linux, mac, win) to just
check whether or not spelling marker appears on 'adf'.

According to bug 295722, the test started using asynchronous
spellchecking.

Since the test verifies spelling behaviour, it was moved
to editing/spelling directory.
Its name was changed to spelling-backward.html.

BUG=295722

Review URL: https://codereview.chromium.org/225183005

git-svn-id: svn://svn.chromium.org/blink/trunk@170928 bbb929c8-8fbe-4397-9dbb-9b2b20218538