[Chromium] WebFontRendering.cpp requires some OS(ANDROID) ifdefs to build downstream

[Chromium] WebFontRendering.cpp requires some OS(ANDROID) ifdefs to build downstream
https://bugs.webkit.org/show_bug.cgi?id=90292

Reviewed by Nate Chapin.

These ifdefs are required to build this file downstream. There's some
sublte difference between how the OS flags are set upstream and
downstream. This is on our list of issues to resolve, but in the
meantime, this patch makes these files identical upstream and
downstream to reduce noise in the upstreaming queue.

* src/linux/WebFontRendering.cpp:
(WebKit::WebFontRendering::setSubpixelPositioning):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@121594 268f45cc-cd09-0410-ab3c-d52691b4dbfc